• Decades of racing development went into the design of the FMF Powercore 4 to improve the power and performance of your dirt bike or ATV at a practical price.
  • The FMF Powercore 4 is a muffler that will boost power and torque throughout the power range, making the Powercore 4 usable for all types of riding.
  • FMF designed a Hi-Flo end cap and core for the Powercore 4 to increase power by creating a free flowing end cap and a core that allows room for exhaust pulse. This results in a consistent power curve.
  • The FMF Powercore 4 uses and advanced cross-weave packing that is more durable then the traditional packing. The cross-weave packing also keeps the Powercore 4 at a reasonable sound level by dissipating the exhaust sound.
  • FMF constructed the Powercore 4 using aluminum to keep the weight down with stainless steel components for extended durability.
  • The FMF Powercore 4 includes a USFS approved spark arrestor.

Rating

9

What It Is

The FMF Racing Powercore 4 Slip-On replaces the stock muffler and mid-pipe. Designed to be an economical way to coax additional horsepower out of your bike, the Powercore 4 Slip-On is designed to complement your bike's stock header pipe.

Hits

Okay, it's time to come clean. We weren't expecting a lot from the Powercore 4 Slip-On for the 2008 Yamaha YZ250F. Why? Because we weren't huge fans of the more expensive Factory 4.1 Megabomb complete system in '07 and didn't think that a simple, pricepoint slip-on offered any significant power gains. Boy, were we wrong! Thanks to some improvements made to the '08 machine as a base starting point, the Powercore 4 Slip-On yields a noticeable boost right from the crack of the throttle! The biggest gains are felt down low, as the YZ250F has a snappy, torquey feel with the Powercore installed. Mid-range power is about the same, but the Yamaha pulls quite a bit further in each gear before flattening out.

Misses

Unlike the stock muffler, which utilizes a large rubber grommet at the subframe mount, the Powercore 4 Slip-On bolts straight to the sub-frame. We know from experience that this will eventually vibrate the rivets holding the mount to the muffler can loose if you don't keep a close eye on eye on them.

The Verdict

FMF Racing designed the Powercore 4 Slip-On to be affordable and effective. When it comes to the '08 Yamaha YZ250F, we'd say it is mission accomplished!

FMF POWERCORE 4 SLIP ON EXHAUST - 4-STROKE

Price Range: $164.99 - $269.99
To purchase this part, please select a ride:
Select from rides that fit this product
Overall:
5 out of 5
5 out of 5
Location: North Prairrie,WI
" I put this mufler on my honda 400ex and sound real nice and it was simple to put on and it come with everything you need to put it on. "
Overall:
5 out of 5
5 out of 5
Location: sc rock hill
purchase of the year
" it look nice sounds even BETTER poping wheelies in fourth gear looks good on my 250ex it matchs the style of my acbars u may need to jet your carb- first or after but it would give u a boost with it. "
Overall:
5 out of 5
5 out of 5
Location: NE Ohio
Right Price
" I could not afford a complete system so I purchased this slip on. I have always purchased FMF pipes and this has lived up to the past purchases. The fit is good and it livened up the motor on my 2009 WR450. "
Overall:
5 out of 5
5 out of 5
Location: Cntral WA. state
Worth every cent and then some!
" I bought a brand new 2011 RMZ 450 and promptly crashed it, bad! New sub frame and exhaust. I just put this exhaust on my bike and it fit perfectly. I didn't even have to put any silicone on before mating the pipes together. Fitment is perfect and the sound is not much above stock but enough that you can tell the difference. Performance? Not so sure. I haven't ridden since April and yesterday was my first ride so I was scared anyway. Lol! "
Overall:
4 out of 5
4 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
4 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Vegas
09 YZ450F
" It was smoking after my first few rides. I re jetted a little richer and it cured this. Sounds great. doesn't seem any louder than stock. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: manchester TN
great product
" looks great fit great easy installation and i can tell that my bike has more power "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
4 out of 5
Performance out of 5
Power:
4 out of 5
Power out of 5
Location: Seattle, WA
Best slip on for the money
" I have this exhaust for both my CRF 150R and CRF 250R and by far it's the best performing and easy fitting exhaust for the money you can get. It produces a great sound and gives your bike some good low end power and torque. Again, great exhaust for the money!! "
Overall:
4 out of 5
4 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
4 out of 5
Performance out of 5
Power:
4 out of 5
Power out of 5
Location: Staunton VA
overall impressed
" I ordered this exhaust for my '06 honda crf250x and just got it installed. the sound is great, makes it sound very similar to and 250r. as for the power... i was expecting more. it adds a little top end but thats about it. love how it looks. one thing i did notice is that when the rear tire is bottomed out, the tire will probably rub the exhaust even with the spacing washer that fmf includes. but overall it seems like a great product. cant wait to really test it out at hatfield mccoy. thumbs up FMF "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: brooklyn ny
sweet
" nice sounding on my 400 ex easy like 4 minute installing worth every penny!!!! "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
4 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: McCordsville, IN
Nice Exhaust
" Got into somebody in a turn and damaged the stock pipe so I had to pick up a replacement. This exhaust has a nice deep tone and opened up a bit more power. The installation was pretty effortless... At first it looked like the factory gasket may need to be salvaged, but the clamp tightened down enough to make a good seal. Overall, worth the money for an aftermarket exhaust. "
Overall:
4 out of 5
4 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
4 out of 5
Style out of 5
Durability:
4 out of 5
Durability out of 5
Performance:
3 out of 5
Performance out of 5
Power:
3 out of 5
Power out of 5
Location: Muskegon, MI
Decent
" The powercore is a excellent pipe for the off roader, but this pipe doesn't match the Over-rev of my recently smashed 4.1. Just needed a cheap fix. Overall, for a YZF bike, Dubach is the way to go, FMF has header to Midpipe sealing problems because of the springed header (Trick is to use 4 springs instead of two). Also, the megabomb can hit the top end oil line and break it. (Fix it by denting in the bomb header by the line. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
4 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
3 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Carmi, IL
great pipe
" just installed this on my 05 Honda 450r with the powerbomb header and it looks and sounds great, not to loud but still lets people know your coming when you get on it! great system would definetly recommend this to anyone looking for a good pipe for a great price. can not comment on durability since i just installed it "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
4 out of 5
Power out of 5
Location: illinois
Great Slip-on
" Installed on a 2008 Yamaha YFZ450 special edition. This slip on really has a wonderful sound and was relatively affordable compared to other slip-ons. it was easy to install, looks really good, but didnt notice huge power gains. I expected that from a slip-on though. I recommend this product to anyone looking for a slip-on exhaust. That's why my brother will be getting his soon. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Not Available
Best Bang for Your Buck
" All I can say is WOW. Huge power increase on my 2009 YZ450F. Really woke it up. Couldn't justify spending so much more on a full system. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
4 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Blissfield, Mi
Awesome pipe
" I put this on my 2008 TRX250EX, This gives my 250 some balls now, Sounds awesome when you give her some gas you'll here her comin. Installation was pretty easy such a sweet looking pipe and puts out everything you would want... Gotta love it!!!!!! "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Not Available
" I bought this for my 2006 ltz 400 and it is perfect, it took me 3 minutes to install, its sounds great and the performance is even better!. Would definitely recommend this to someone!. "
Overall:
5 out of 5
5 out of 5
Location: Not Available
The way to go.
" This muffler is just perfect. Sound and power unbelievable. Goooood pipe. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
4 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
4 out of 5
Performance out of 5
Power:
3 out of 5
Power out of 5
Location: Columbus Grove, OH
Good Buy
" This was a great buy for my 08' Honda 400ex. Very easy to install other than one problem. The hose clamp that it came with to hold the mid-pipe and the head-pipe together was too small. I called FMF and they said that they do not require it for the stock head-pipe and said just the high-temp silicon would work. So just to make sure I went out and bought a bigger hose clamp. Other than that issue the sound is great and it really woke my stock 400EX up with that and a Moose Racing stage 1 jet kit. The sound is quite impressive for just a slip on. I plan on adding FMF's Powerbomb head-pipe as well so we will see how that one works out. P.S. If you are running this with a stock air filter make sure to leave the air box lid on. I tried running it with it off and my performance was hurt terribly, not to mention that there was a throttle delay. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Glendive, MT
Good bang for the buck
" I had picked this product out for my birthday and installed it on my 07 Wr250f over spring break in a matter of 30 minutes. Finally got to ride now that the snow is melted and was very impressed. There was noticeable difference in the low end torque and a power increase across the board. The bike was significantly more snappy and wants to pull the front tire off the ground through every gear if traction will allow. Great buy, will recommend to friends. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Saucier, MS
Awesome pipe
" I bought this pipe for my 2008 yfz450 and it was extremely easy to install. The throttle response was improved greatly and the power increase was very noticable. I deffinately reccomend this pipe to any one looking for a good system. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Not Available
Wow!
" I purchased this muffler for my 08 YZ450F. Primarily for the spark arrestor. I was blown away by the power increase. The pipe was easy to install took less than 20 minutes. I had to jump to a 165 main jet, that took more time than the actual install of the pipe. Can't comment on durability since I haven't crashed with it yet. "
Overall:
4 out of 5
4 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
4 out of 5
Style out of 5
Durability:
4 out of 5
Durability out of 5
Performance:
4 out of 5
Performance out of 5
Power:
4 out of 5
Power out of 5
Location: manteca, ca
Great muffler for spark arrestors
" I purchased this muffler because the stock muffler on a YZ250F doesn't have a spark arrestor. This is a great entry level exhaust that comes with the spark arrestor for the money. It sounds almost identical to my stock exhaust which surprised me a bit. It looks much nicer though. Simple install in the home garage with basic tools. Great buy. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
3 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
3 out of 5
Performance out of 5
Power:
3 out of 5
Power out of 5
Location: Bay City, MI USA!
Three years and still kicking
" Selling my '03 DS650 that has had this PC4 on it for almost three years now, bought new from here. It sounds godly on such a big machine and pretty descent power gains, not as much as I expected. The packing inside is just about needing a repacking as it is at the 96db sound level now(when new it was 94db) "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: middletown
good buy
" i really like this pipe in does in fact increase the horsepower of my warrior and makes it sound great "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
4 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
4 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Lowell,IN
great buy
" I bought this for my 2002 400ex and its great. I just got a fmf header power bomb for even more power which i pri dont need. I dirt and ice race with the bike and its louder then sum of the other guys. Its got that great pop sound and i love it. when i first put it on my neighbor called the cops on me haha but thats in a neighbor hud. its a great buy im telling u. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
4 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Not Available
AWESOME
" just got it in today put it right on. started my bike it sounds great and looks awesome. dont know how it performs cause theres snow on the ground cant wait to get it out and ride. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
3 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
3 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: pittsburgh PA
good pipe
" i like the pipe good performence im not exackley sure wat on the bike is better because of this rpm range is smoother than my older aftermarket pipe but i like it it whispers at idol but screams at full throttle it might just b me but it seems like it reves higher and faster as well the only thing is the thread housing aat the mid point of th pipe watch out its really weak i stripped the bolt and had to re tap it other wise i like it it certainly looks good "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
4 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Willoughby, Ohio
Nice Exhaust Worth The Money
" This is a very nice exhaust that works great with the megabomb header. Increases horsepower noticeably. Great fit and finish and best of all that loud thumper sound. Run it wide open but comes with spark arrestor which comes in handy at the National Forrest. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
4 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
4 out of 5
Power out of 5
Location: Not Available
awsome
" this is a very nice pipe it was easy to install and it sound good thow the difference in sound is not great. itonly took me a 16 year old 30 mins to put on. i would recommend this pipe to anyone that rides. "
Overall:
4 out of 5
4 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
4 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
4 out of 5
Performance out of 5
Power:
4 out of 5
Power out of 5
Location: seattle.WA
best buy for the price!
" i have an 06 crf250r slipped right on, cant tell the sound difference that much, but looks good!, had the carb re-jetted havnt had time yet to ride it, so i woulnt know if there was a power difference... "
Overall:
3 out of 5
3 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
3 out of 5
Durability out of 5
Performance:
3 out of 5
Performance out of 5
Power:
2 out of 5
Power out of 5
Location: north carolina
Its ok
" It looks good and sounds good. it might hav given a little more top end...but not much. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
4 out of 5
Ease of Installation out of 5
Style:
4 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Not Available
THE BEST
" This is one great pipe..im 14 and it was easy for me and my buddy to put on....works great sounds good "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
3 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
4 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Not Available
Good Exhaust
" I just put this on my 2008 trx250ex and it runs great. The pipe was a little difficult to install on this quad but after it is on it is awesome. Increases power and speed. The pipe is a little different looking than what the picture for the 250 says but it looks better in person. It has a good sound to it. I would recommend this pipe to someone who has a 250ex. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: cumberland, RI
its a killer.
" i bought this pipe for the power and i was amazed by the amount of power it puts out. i could never rip up a wheelie in 5th gear on my 07 250ex but now i can it looks great and has an awsome sound to it. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
4 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Binghamton NY
" Awesome power. A little difficult to install but it was worth it. Had to re-jet but was a simple fix "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: mobile alabama
excellent
" idiot proof installation great sound and good power increase i just put it on my 2009 ltz 400 n added awsome appearance to it it gave it a good bark with more bite "
Overall:
2 out of 5
2 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
1 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Broken Bow, Nebraska
XCF250 2008
" This pipe did give me excellent power and a noticeable noise increase. However, the pipe only has one clamp where the stock pipe has two, this pipe never fit well. It was constantly getting into my tire from day one. I switched back to my stock pipe. This was with the stock head pipe! I do not recoment buying this for an XCF250 KTM. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
4 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Kalamazoo/Luther Michigan
Two thumbs up!
" EASY TO INSTALL!! Mounted right up to my yfz450 without a problem. Sounds great - not obnoxiously loud, but throaty!! Went from old blown out stock pipe to this, noticalbe difference in power. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Lakeside,CA
" I just put this pipe on my 2008 Trx250ex and it sounds Awsome and it looks awsome......i havent got a chance to ride with the pipe yet but ill write another review to let everyone know "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
5 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: tulsa ok.
660 raptor
" bought this exhaust for 05 660 raptor pretty loud without sparky but with it it mellows it out. i got drastic increase in power through all ranges. was a very easy add on.i will defenitly buy the header to match. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
4 out of 5
Ease of Installation out of 5
Style:
4 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: Long Island, New York
Awsome Pipe For The Money
" Ok, funny thing is i bought this for my 06 yz450f, as a slip on, then recently bought an 06 yz250f with an fmf power bomb header, i thought hey, maybe the power core 4 will fit on my 250. Sure enough it did. The slip on is loud even with the spark arresterator in it, looks nice, sounds great and adds a good amount of power. I would recomend the header to because with the 2 together, it is a great combination, alot like the 4.1. Id recomend jetting it to because it has great power out of the box but with a jet kit, it is insaine. "
Overall:
5 out of 5
5 out of 5
Ease of Installation:
5 out of 5
Ease of Installation out of 5
Style:
4 out of 5
Style out of 5
Durability:
5 out of 5
Durability out of 5
Performance:
5 out of 5
Performance out of 5
Power:
5 out of 5
Power out of 5
Location: cape may, NJ
performance and power at its best
" i recently purchased this exhaust for my 07 crf 450r and i all most wanted to take it off the power was so extreme it was like to fast....i never been so satisfied with a pipe if u want power,at its finest choose fmf. its cheap too. "
Overall:
5 out of 5
5 out of 5
Location: Not Available
" just bought the 09 yzf 450 and just made it complete with the fmf powercore 4 slip on "
Overall:
4 out of 5
4 out of 5
Location: Not Available
Good Exhaust
" Have crf250r and bought this exhaust. NO noticeable power gain. Great sound and feel all through the power band. Only got it for the spark arrestor. If your looking for more power buy a bigger bike. "
Overall:
5 out of 5
5 out of 5
Location: Jackson, MI
" Just purchased for my 08' z400, significant power increase and it sounds much better. Great buy, especially for the price! "
Overall:
5 out of 5
5 out of 5
Location: amherst MASS
Excellent!
" This pipe gave me instant power even before i installed the jet kit and air filter. It sounds awesome and is not too loud. Would buy it again no doubt. "
Overall:
5 out of 5
5 out of 5
Location: Eureka, CA
Great investment
" I got this for my 07 YFZ 450 and it made a huge power gain and sound improvement. Along with this muffler i picked up the FMF Powerbomb moto header and the FMF Jet kit. I would say that it increased my horse power by at least 10%. Easy to install. "
Overall:
5 out of 5
5 out of 5
Location: Not Available
best ever
" this pipe is the greatest didn't take very long to put on, instant power gain that i felt great pipe a definate buy. "
Overall:
5 out of 5
5 out of 5
Location: ma
Great exhaust
" I have a 07 raptor 350 and it fit perfect an only took about a half hour to install. The sound is amazing and I looks great, if you have a stock exhaust and are looking for a nice sound that’s not to loud this is the one. Motosport had a fast no hassle shipment "
Overall:
5 out of 5
5 out of 5
Location: Branson, Mo
Great Choice
" I installed the powercore IV on a 400ex, this thing sounds great. Deep powerfull tone, without being too loud. Would recommend to anyone. Motosports service and shipping was terrific. "
Overall:
5 out of 5
5 out of 5
Location: Florida
FMF Powercore 4
" I love this exhaust! Put it on my 06 400ex and made it come alive immediately. I used a 155 main jet also.You can really feel the xtra power and its not too loud like some other exhausts. Has a nice tone but make the bike sound alot meaner and all around just feels better with this exhaust.. I would recommend it to anyone. "
Overall:
5 out of 5
5 out of 5
Location: bellefont pa
awesome
" this exhaust is great i like the performance upgrade it gave me and i also love the sound i would buy another if i had another atv and would also recomend to a friend the installation was really easy i have a 05 raptor 660 "
Overall:
5 out of 5
5 out of 5
Location: Not Available
Power
" This slip on is one of the best on the market. Its worth the money by far. Noticable power gain and great sound. "
Overall:
5 out of 5
5 out of 5
Location: Tremont,IL
Awesome Power and sound
" I put this exghaust on my YFZ 450 and it was easy to install, it has an awesome sound by far one of the loudest exghausts. And it sounds awesome. "
Overall:
5 out of 5
5 out of 5
Location: stillwater, ok
Great!
" Sounds great! I could tell there were definite power gains and like i said it sounds amazing! I had it on my warrior along with a powerbomb header. "
Overall:
4 out of 5
4 out of 5
Location: BEL AIR, MD
" I have a the powercore slip-on for my 06 trx400. Good power gain with a great sound. "
Overall:
4 out of 5
4 out of 5
Location: Albany, Oregon
My favorite slip-on
" This is a great pipe. I first purchased this exhaust for the deep throaty sonics that it produced. The installation was simple and quick. I also liked that the slip-on has two places where it bolted to my quad frame, which makes it very secure. After installation I notice a significant gain in the torque and low end accelleration. I definetely recommend this slip-on. "
how loud will this make my 350 raptor?
how many decibals?
Asked by beadure
it won't make i a lot louder. I dont have a db rating for this application. it is forest service approved.
Answered by dirt
will i have to change the jets in my 2005 crf 250r for this??
Asked by colton1234567890
it is always a good idea to check your jetting when changing exhaust or intake. you are moving more air, therefore you want to give the engine more fuel.
Answered by dirt
Will this fit on my 2004 crf250r stock head pipe?
Asked by Sethslayer
yes the powercore 4 is made to fit your stock head pipe
Answered by JesseC, Tualatin
Does it come with the end caps and inserts?
Asked by kevinb, RI
This includes the Spark arrestor insert.
Answered by james718
Is the pipe included?
Asked by Paponte
I have a 07 raptor 350 and the powercore iv came with the pipe and everything you need to bolt it on
Answered by mikeb
Is the muffler repackable and spark screen replaceable?
Asked by 86gt
The muffler is repackable, by loosening 4 allen screws. the spark screen is replaceable by 1 screw. hope that helps.
Answered by 07YFZ450Rider, Eureka, CA
will this work?
Asked by hondakid2
this is designed to be used with the stock OEM head pipe.
Answered by james718
will this fit with the fmf powerbomb header
Asked by ridered469
Yes it will
Answered by Drewski, Portland, OR
Does the pipe come with jetting specs?
Asked by 07EX
It should come with recommendations but sometimes they don't, install the pipe and see how the bike responds. Then take it from there.
Answered by Drewski, Portland, OR
what pipe is better the powercore 4 or the powercore?
Asked by vinceTMV60, Brea, CA
No difference
Answered by CRF250RRRRRR
Do you need the Fmf Powercore IV bracket on a 1999 Yamaha Warrior 350.
Asked by bugboy88, Dry run
No bracket should be needed. It should have came ready to bolt right on. You might want to contact FMF.
Answered by Drewski, Portland, OR
FMF Powercore slip-on
Asked by Racer1, Abingdon, IL
I don't think the spark arrestor has much to do with it. but running at 20 degrees has to put you in a very lean running condition if it's not jetted to that temp...you will probably have to go up 1or 2 sizes on you're main jet,drop the clip one position on the needle and turn out the fuel screw another half turn or more
Answered by davel, Harrisville,RI
Will it Fit stock header?
Asked by brotherman
As long as they offer this system for your Bike or ATV it would be designed to fit the stock head pipe. In some cases the manufactures design the systems so you would be able to add a head pipe at a later time.
Answered by bountybob, Tualatin
power?
Asked by rider, washington
It's mainly going to improve the bottom and mid range. It does have a pretty decent boost in the top end as well.
Answered by Drewski, Portland, OR
what is the dbl for the fmf powercore 1V
Asked by axman, california
The sound output for the powercore IV should be approximately 100db. The quietcore insert should bring it down to about 96db.
Answered by BOB3
what jets?
Asked by brocktrx, middleburg fl
Unfortunately I cant give out any jetting specs since there are a lot of things that could judge it. The best thing to do is install your exhaust, see how it responds, then take the bike to a local shop of call a local shop for some recommendations. Changing the jets can be a little complicating so if you haven't pulled apart a carb before I would have a professional mechanic install the jets for you.
Answered by Drewski, Por+land
2005 KX250F when I put on this item I lost my bottom end? Is this a jetting issue?
Asked by BCDC
Most likely.. You shouldn't have lost any bottom end with this exhaust. Check the jetting out and you should be good.
Answered by Drewski, P+RTLAND
whats in the package????
Asked by acemaster067
no this is just the slip on, no head pipe included
Answered by JesseC, Tualatin
what is the difference in the powercore and the 4.1?
Asked by victor8668
the 4.1 is really light is easy to repack new and improved power to improve performance and shrter length for better handeling
Answered by pfunk, cape may, NJ
How many db is this pipe for a yfz450?
Asked by nodorftj
probably about 150db depending on how high your rpms are
Answered by Dirtrider1234, harrisburg nc
2007 trx250ex
Asked by trx3
This is only a slip-on exhaust which includes the canister and mid pipe only.
Answered by james718, Portland, OR
Can I use it with a MegaBomb?
Asked by raymondcidad
This slip on muffler will work with the MegaBomb header, but you will need to re-jet.
Answered by 07YFZ450Rider, Eureka, CA
2007 trx250
Asked by trx3
Dont base what you will receive off the pictures. Yes it will be the same item, but since bends of pipes, lengths, etc.. depend on what bike it's ordered for we can t picture every single exhaust system for each bike and year. If you don't trust the website, call in over the phone and talk to someone.
Answered by Drewski, P+RTLAND
If you put this pipe on with a stock header is there a noticeable power increase
Asked by Zacky
Yes, you will gain a little bit of power, but not like a full system.
Answered by Drewski, P+RTLAND
If you buy this pipe do you have to re-jet or will you be okay?
Asked by Zacky
It's always recommended to check your jetting after installing any exhaust component.
Answered by Drewski, P+RTLAND
To take advantage of the new pipe I highly recommend rejetting, as far as it being ok, in most cases I would say it's fine, just need to readjust the carb a little.
Answered by Ciderax, Arizona, AZ
Is it ok to put a megabomb header on this pipe?
Asked by Zacky
The FMF Megabomb Header will work fine with this exhaust.
Answered by james718, Portland, OR
Yes, all of the FMF pipes are compatible with all FMF headers. You can mix and match to suit your preference/needs.
Answered by Paul241
Is this the muffler only or is mid-pipe included?
Asked by Zacky
this is the muffler only
Answered by CamCam
Will this have a low bass sound?
Asked by minh
The exhaust has a good tone. Try and check out some sound clips on youtube or something.
Answered by Drewski, P+RTLAND
is the slip on exhaust suppose to go over the header or on the inside
Asked by tclax
Normally the header goes inside the slip on.
Answered by Drewski, P+RTLAND
Removing Sparkarrestor?
Asked by lorenzo
There should just be a set screw holding the screen in then it should slide right out.
Answered by Drewski, P+RTLAND
you have to put a little force behind it it will come out
Answered by squeeze, mobile alabama
I have a 2008 KTM SXF 250 i put on this slip-on and it wiggles just enough to break the silicone seal everytime... what should i do to prevent this?
Asked by ktmsxf250
I would suggest giving FMF a call and see if they know what might be causing the pipe to vibrate. The nice thing with FMF is all of their pipes are build in house, not in some factory in china.
Answered by james718, USA
Is it a simple bolt-on installation?
Asked by CRF250Xrider
Yup, just remove your old one and reinstall the new one the same way.
Answered by Drewski, P+RTLAND
would I notice a big difference if I switch from dual exhaust on the crf250r to a single exhaust?
Asked by fox250r
If you're riding the bike to its fullest, you might notice a difference between a single or dual exhaust. It's my understanding Honda choose the smaller dual exhaust for better low end response and to bring the sound level down. By switching to a single can, you might notice a increase in the top end, but the bike will be louder. But typically any aftermarket exhaust system will out perform the stock pipes, and this usually applies to any bike.
Answered by james718, USA
Would it be worth putting on a yamaha ttr 230?
Asked by sledneckyle
Yes. You would notice fairly good power gains over stock
Answered by RCB255, Tualatin, Or
I put one on a TTR-230 and it made a difference in throttle response and low end power. Not to loud but sounds good!
Answered by Bayou250X, Monroe, Louisiana
Is this or the Pro Circuit Ti-4 GT low boy louder?
Asked by Zacky
they are comparable in sound.
Answered by james718, USA
do i need to rejet my carburetor on my 2006 KLX125L if i buy this slip on pipe
Asked by dan24
You may or may not, it all depends. take a look at FMF jetting specs for recommended jets. http://www.fmfracing.com/TechSupport/JettingCenter
Answered by james718, USA
does it work with the powerbomb header
Asked by gbush
Yes i believe it would
Answered by mxracer72
is it worth it on a 2000 xr 200
Asked by mxrider1995
It will help with your bottom to mid range power. Well wort it
Answered by RCB255, Tualatin, Or
Is the picture the actual one that is shipped?
Asked by jjjj, Corona, CA
its a bran new pipe. the picture though is just a general picture so it will vary per application.
Answered by hondarob
How loud is the fmf Exhuast
Asked by drz125
It's a little louder then stock but not that loud compare to the pro circuit and the hmf pipes.. but big difference in trottle response!!! I got it on my trx400 big difference in my trottle response...
Answered by stan10, hawaii
I have a Titanium Powercore, its about 100db at an idle. It sounds good, you can hear yourself think. But when you get on it, It will let everyone know your comming!!! I love it..
Answered by DIRTBOY22, Texas
Can You...
Asked by Zacky
If your bike is listed it will fit.
Answered by MotoMoo2, Portland
How Does...
Asked by Zacky
it fits the stock head pipe they give you a spacer to put into the silencer (if u have a stock header)
Answered by kibz32
400ex jetting
Asked by Bryan714
we recommend a jet kit and follow the directions.
Answered by dirt
Can I Do This?
Asked by Zacky
Exhaust was designed to function as a single exhaust system. This will not mount to the stock mid-pipe.
Answered by MotoMoo2, Portland
What comes in this.
Asked by Zacky
it comes with the pipe shown up to your header , the bracket for the muffler and the bolts i recieved it for my 03 crf 450 and the bolts didnt fit where they where supposed to they had to go in the opposite sides of where the instrucions said
Answered by kibz32
You will need to use your stock hardware to mount this exhaust.
Answered by MotoMoo2, Portland
How does this fit?
Asked by Zacky
This exhaust will include a mid-pipe for most applications. You will want to use the mid-pipe, if it is included for your bike.
Answered by MotoMoo2, Portland

ATV

ARCTIC CAT

ARCTIC CAT DVX400
Bombardier

Bombardier DS650
Honda

Honda TRX250EX
Honda TRX250X
Honda TRX400EX
Honda TRX450R (ELECTRIC START)
Honda TRX450R (KICK START)
Honda TRX90
Honda TRX90EX
Honda TRX90X
Kawasaki

Kawasaki KFX400
KTM

KTM 450SX ATV
KTM 450XC ATV
KTM 505SX ATV
KTM 525XC ATV
Polaris

Polaris PREDATOR 500
Suzuki

Suzuki LT-R450
Suzuki LTZ400
Yamaha

Yamaha RAPTOR 350
Yamaha RAPTOR 660
Yamaha RAPTOR 700

Yamaha WARRIOR

Yamaha YFM 80 / RAPTOR 80
Yamaha YFZ450
Yamaha YFZ450R
Yamaha YFZ450X

Dirt Bike

Honda

Honda CRF150F
Honda CRF150R
Honda CRF230F
Honda CRF250R
Honda CRF250X
Honda CRF450R
Honda CRF450X
Honda XR200
Kawasaki

Kawasaki KLX125
Kawasaki KLX125L
Kawasaki KLX450R
Kawasaki KX250F
Kawasaki KX450F
KTM

KTM 250SXF
KTM 250XCF
KTM 250XCFW
KTM 350SXF
KTM 350XCFW
KTM 400EXC
KTM 400XCW
KTM 450EXC
KTM 450MXC
KTM 450SX
KTM 450SXF
KTM 450XC
KTM 450XCF
KTM 450XCW
KTM 505SXF
KTM 505XCF
KTM 525EXC
KTM 525MXC
KTM 525SX
KTM 525XC
KTM 530EXC
KTM 530XCW
Suzuki

Suzuki DRZ125
Suzuki DRZ125L
Suzuki RMX450Z
Suzuki RMZ250
Suzuki RMZ450
Yamaha

Yamaha TTR125
Yamaha TTR125L
Yamaha TTR225
Yamaha TTR230
Yamaha WR250F
Yamaha WR450F
Yamaha YZ250F
Yamaha YZ450F

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