FMF Factory 4.1 Titanium Slip-On RCT - Natural

FMF Factory 4.1 Titanium Slip-On RCT - Natural
FMF Factory 4.1 Titanium Slip-On RCT - Natural

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Description See Also: 28 Reviews 31 Questions
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28 Reviews
4.6 out of 5 stars
5 Star   31 4 Star   3 3 Star   0 2 Star   0 1 Star   0
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All Reviews
Nathan Verified Purchaser
Asheboro North Carolina
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Looks good,sounds good,and easy to install

Would definitely recommend this to anyone wanting to
Enhance your performance or looking for a
Pipe that looks good. FMF!!!!

FMF Factory 4.1 Titanium Slip-On RCT - Natural
Mizike Verified Purchaser
Perry, FL, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5

Love the silencer and it's a little smaller than stock.. has a nice sound..

Dirty5thirty Verified Purchaser
Durability 5/5 Ease of Installation 3/5 Performance 5/5 Power 5/5 Style 4/5
Fittment

The coupler pipe In-between the header and the muffler was really tight and I had to use a mallet to hammer it on but otherwise I like the system a lot.

DJ05
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
FMF all day all day

This is the sexiest exhaust east of the Mississippi! Best Quality and performance too!

BOOM!
John Verified Purchaser
Idaho
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 4/5 Style 5/5
Fmf 4.1 2016 kx450f

Put this on my 16 kx450f and it woke it up a lot! Worth the money in my opinion and it looks great

FMF Factory 4.1 Titanium Slip-On RCT - Natural
FMF41 Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Husky FC 350

Did a lot of mods to get bike running the way I wanted--needed a lot more bottom end power than stock setup. This was by far the best change I made. More power across rev range, but also smooth delivery so power is really usable. I would put this pipe on any bike for sure.

Davethedirtbag Verified Purchaser
Philadelphia pa
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Braaap!

A good gain in low end and this baby barks like a dog!!!!!

jkeefer Verified Purchaser
audubon, pa
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Must have for sound and offroad

I had the bike apart for suspension work and researched the mufflers to bring the stock kawi screech inline with ama requirements. I also wanted a spark arrestor for free riding offroad. This is the only one i could find to meet those needs. I am pleased.

AF141 Verified Purchaser
Double springs alabama
Durability 5/5 Ease of Installation 4/5 Performance 5/5 Power 5/5 Style 5/5
2014 kx450f FMF 4.1

I could really tell a difference from the bottom end up till about mid range with just the slip on. It sounds great and looks great. Highly recommended.

FMF Factory 4.1 Titanium Slip-On RCT - Natural
ardenb64 Top 500 Contributor
New Orleans, LA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Beautiful. Powerful. Light

You can feel the weight difference in your hands from stock to this beauty. Power is noticeable instantly. This will probably be the only engine mod I do to my KTM.

Motosport was out of the header and pipe together--on backorder for 4 months! so I had to purchase separate at $50 more. Bummed about that!

isn't she pretty?
yz450rider
Pleasant Prairie, WI, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Excellent purchase

Lots more bottom end power with this unit compared to
stock one. Pretty loud without insert installed.

FMF Factory 4.1 Titanium Slip-On RCT - Natural
dentoncm Verified Purchaser
pueblo, co
Durability 4/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Kx 250f 2014

this pipe is awesome. I have had it for 6 months now and it looks and performs awesome. it bolted right on to my bike, I also only got the slip on and had no problems with It and the stock header.

13kx450fff Verified Purchaser
Durability 3/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Kx450f

Sounds good, looks good. Removable spark arrestor. Con: sticker peeling from factory

Kaah Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Great exhaust

This exhaust is a few pounds lighter than the stock silencer on my 2015 KTM 500 EXC. it also gave the bike the sound I was looking for. The best part is that it freed up more power in the low to mid range. As the stock silencer was super restricting

Winkabeast Verified Purchaser
New York State
Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Bolt on Horsepower !

Incredible performance boost.
This slip on made more difference in performance to my KTM 500 EXC than any other aftermarket pipe has ever made to any other bike I have ever upgraded.
Looses nothing on top, but sharpens up the bottom and midrange hit.
Super responsive and fun.
Much lighter than the stock piece as well.
It's loud when it's hitting, but you can control the noise with good gear selection and rpm when you need it to be quieter.
It works, it's light, it bolts right on, and it looks cool.
Nothing not to like !

Jeff Verified Purchaser
San Diego, CA, USA
Ease of Installation 5/5 Style 5/5
It's maaaaaaaaaaadddd

This exhaust is by far the best investment I've made for my 2013 YZ450f. Though I haven't purchased the header yet, it sounds awesome and looks awesome as well. I haven't ridden with it on yet, but I can't wait! Only problem was FMF recommends using heat resistant silicone, which i didn't have lying around. But it's fine, I went to Walmart and problem solved.

Boom baby
Cobbulator Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Great pipe!

Very good quiality and sound. Bolted right up and saved weight over stocker.

cjlyon
Oklahoma
Durability 4/5 Ease of Installation 5/5 Performance 4/5 Power 3/5 Style 4/5
Beware of the weight

The posted weight on motosport is 1.3 pounds, but the acutal weight is around 5 pounds. I made the mistake of trusting the website on the weight specs.

Jolo
Woodland Park, CO 80863, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Excellent Mod

Installed on my 2013 KTM 350 xcf-w and I immediately felt the difference in throttle response. Seems to pull harder earlier. Very easy to install onto stock header. Spark arrestor was extremely easy to install also. Looks and sounds great.

BW281
Laveen, AZ
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
FMF 4.1 RCT on 2013 KTM 450

This pipe absolutely cures the common complaint about the new 450SXF's lacking on bottom end torque. 3rd gear wheelies out of hairpin corners are common now even without a click kick. Once you take your stock muffler off, try looking through it and you'll see why the bike is so choked up. Installs in a few minutes.

See 8 More Reviews
31 Questions
Answered:   31
Not Yet:   0
Riaan
Location: Chester mt
Q: Will the 2016 fc450 pipe fit the 2017 fc 450?
1 month 14 days ago
Motoman59
1 month 2 days ago
A: Yes
Jamesrides
Location: Blue Grass, IA 52726, USA
Q: Fitment(2011 kx250f)?
3 months 1 day ago
Could i put this on my 2011 kx250f without the fmf head pipe using a stock headpipe
MotoSportExpert
MotoSport Staff Expert
2 months 25 days ago
A: For the most part, yes. FMF build their mufflers to be fully interchangeable between all of our products and stock components. This way you don't have to worry about something not fitting down the road.

There are a few instances where the FMF muffler will only fit an FMF header, but that's because FMF was not able to get the gains/fit they wanted with out making it an FMF only version. For the most part these are KTMs only.
Decker26
Location: Sussex, NJ 07461, USA
Q: What do I have to jet my 2011yz250f to with the silencer?
Over 6 months ago
MotoSportExpert
Expert MotoSport Staff
Over 6 months ago
A: There is not a specific setting I could give you for jetting your bike. It would really depend on your location (altitude/temperature) and how your bike is running with the current jetting. Jetting can be very tricky, there isn't one setting that will work everywhere with every bike. However normally when installing a slip-on only minor jetting changes are needed, if any at all. If your bike is currently jetted properly you will likely not have to make any changes after installing this slip-on. I would recommend installing the exhaust and riding the bike to see how it is running then tuning your carburetor from there if necessary.
knuth38
Q: Does the slip-on come with the spark arrestor already installed or does it need to be installed separately?
Over 7 months ago
DJ05
Over 7 months ago
A: It comes with a spark arrestor. It is not already installed. All you have to do is slide in the back and put the clip in!
tristenjd
Q: Can I put this on my 2004 Husqvarna TE450?
Over 9 months ago
MotoSportExpert
MotoSport Staff Expert
Over 8 months ago
A: No sorry, this will not fit your 2004 Husqvarna TE 450.
Zack
Q: What are your thoughts of having to re-map the bike with just the FMF slip on exhaust with stock header?
Over 9 months ago
MotoSportExpert
Expert MotoSport Staff
Over 9 months ago
A: Generally with a slip on exhaust you will not need a programmer. I would recommend installing the exhaust and riding the bike to see how it is running then tuning your bike from there if necessary.
bfed88
Q: I already have the fmf power bomb head will these slip ons fit on that or is it designed to fit the stock head pipe?
Over 9 months ago
MotoSportExpert
MotoSport Staff Expert
Over 9 months ago
A: FMF headers, whether it be the PowerBomb or the MegaBomb, are fitted to match an FMF series muffler. We do not recommend or guarantee you try to match it to a stock muffler.
Racer95
Location: Maine, USA
Q: What is the weight difference between the stock pipe and the titanium fmf?
1 year ago
I have a 2012 kx250f and I was wondering what the weight difference is between the stock muffle and the titanium muffler with carbon fiber end cap?
MotoSportExpert
Expert MotoSport Staff
1 year ago
A: The FMF Factory 4.1 RCT Slip-On Exhaust (Titanium with carbon end cap 042259) for your 2012 Kawasaki KX250F weighs 4.4lbs. Unfortunately we do not have the weight on a stock system.
Mads
Location: Denmark
Q: Can i by a headpipe later?
1 year ago
If i by this Slip-on, can i buy a headpipe later? and then have the full fmf exhaust? or does a megabomb headpipe not fit on a slip-on?? Mads - Denmark
MotoSportExpert
Expert MotoSport Staff
1 year ago
A: For the most part, yes. FMF builds their mufflers to be fully interchangeable between all FMF products and stock components. This way you don't have to worry about something not fitting down the road.
There are a few instances where FMF mufflers will only fit an FMF header, but that's because FMF was not able to get the gains/fit they wanted with out making it an FMF only version.
You should have no issues on your 2013 Kawasaki KX250F.
Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
crader215
Location: Gresham, OR, USA
Q: Do I have to re-map my 2015 CRF450R with a complet exhuast system?
1 year 1 month ago
Is it necessary to re-map? will it hurt the bike in anyway?
MotoSportExpert
MotoSport Staff Expert
1 year 1 month ago
A: For optimum performance when installing a full system, programming is recommended.
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