FMF Factory 4.1 RCT Slip-On Exhaust

FMF Factory 4.1 RCT Slip-On Exhaust
FMF Factory 4.1 RCT Slip-On Exhaust

$337.49 - $539.99
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Item #FMF000P

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34 Reviews
4.6 out of 5 stars
5 Star   38 4 Star   3 3 Star   0 2 Star   0 1 Star   0
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All Reviews
shameless Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Made in the USA

i love FMF born in so cal! i will always support FMF and what there about best exhaust hands down ........period

tlyle27
Chesapeake, VA, USA
Durability 4/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Nice buy

purchased for my 2016 ktm 350 sxf, combo with header and it really opened up the bottom end and mid range power. sounds amazing too.

Motobro124
Houston, TX
Durability 4/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Aweome pipe

I was running a yoshi previously and wanted to try something new. Nice quality, easy install (my Yoshi had to be slightly modified), made in the USA, great power gains, and killer looks.... what else can you ask for?!

Speed Verified Purchaser
Chicago, IL
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Great fitment

Fits perfect. Runs great!

Skellerz11 Verified Purchaser
Norwalk ca
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 3/5 Style 5/5
Sounds so good

This was very easy to install sounds really good can't wait to get the rest of the exhaust

ktmbill
Oregon
Durability 4/5 Ease of Installation 5/5 Performance 5/5 Power 4/5 Style 4/5
Great pipe for the money

Makes more power across a broad RPM range. Sounds great. I have only ridden with pipe 2x s so its to early to tell on durabuility,but I'm sure it will be as good or better then the other fmf pipes I have had. BEST OF ALL ITS MADE IN THE U.S.A.

RacerX Verified Purchaser
Maryland, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Performance

The install was easy and as ausual the FMF performance is great .

1poordad Verified Purchaser
Virginia, usa
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Sounds great

Put on my sons kx250f. Sound is down right evel. Power is comparable to his older exhaust (aftermarket). For the price, it's a good muffler.

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 RCT Slip-On Exhaust
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 RCT Slip-On Exhaust
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 RCT Slip-On Exhaust
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 RCT Slip-On Exhaust
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.

See 14 More Reviews
31 Questions
Answered:   28
Not Yet:   3
noah
Location: Cold Spring, MN 56320, USA
Q: Will this fit my 2010 yz250f stock header?
Over 7 months ago
72Honda
Location: South africa
Q: Will my 2015 CRF450R single fmf slip-on exhaust fit on a 2017 CRF450R?
Over 7 months ago
marty
Location: Western Australia, Australia
Q: If i have a rc-4 pro circuit header will this 4.1 rct slip on fit with it or not?
Over 8 months ago
Riaan
Location: Chester mt
Q: Will the 2016 fc450 pipe fit the 2017 fc 450?
Over 12 months ago
Motoman59
Over 11 months ago
A: Yes
Jamesrides
Location: Blue Grass, IA 52726, USA
Q: Fitment(2011 kx250f)?
1 year 1 month ago
Could i put this on my 2011 kx250f without the fmf head pipe using a stock headpipe
MotoSportExpert
MotoSport Staff Expert
1 year 1 month 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?
1 year 4 months ago
MotoSportExpert
Expert MotoSport Staff
1 year 4 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?
1 year 6 months ago
DJ05
1 year 5 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?
1 year 7 months ago
MotoSportExpert
MotoSport Staff Expert
1 year 7 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?
1 year 8 months ago
MotoSportExpert
Expert MotoSport Staff
1 year 8 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?
1 year 8 months ago
MotoSportExpert
MotoSport Staff Expert
1 year 8 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.
1-10 of 31
Fitment
See all bikes that this part fits...
See Fitments
# Part Numbers
Product Variant Manufacturer Part #
Blue Anodized Titanium With Titanium Mid Pipe 042285
Natural Titanium With Titanium Mid Pipe 045474
Natural Titanium With Titanium Mid Pipe 042284
Aluminum With Stainless Steel Mid Pipe 045472
Aluminum With Stainless Steel Mid Pipe 042299
Aluminum With Stainless Steel Mid Pipe 042300
Aluminum With Stainless Steel Mid Pipe 042301
Aluminum With Stainless Steel Mid Pipe 043346
Aluminum With Stainless Steel Mid Pipe 043328
Aluminum With Stainless Steel Mid Pipe 044390
Blue Anodized Titanium 041508
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 041473
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 041474
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 042290
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 042291
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 042292
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 043319
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 043347
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 043320
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 044382
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 044427
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 044383
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 041507
Blue Anodized Titanium With Titanium Mid Pipe 041439
Blue Anodized Titanium With Titanium Mid Pipe 041447
Blue Anodized Titanium With Titanium Mid Pipe 042258
Blue Anodized Titanium With Titanium Mid Pipe 043349
Blue Anodized Titanium With Titanium Mid Pipe 044364
Blue Anodized Titanium With Titanium Mid Pipe 044429
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 041440
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 042259
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 042267
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 042286
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 043350
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 043303
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 045561
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 044365
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 044373
Blue Anodized Titanium With Carbon Fiber End Cap 044409
Natural Titanium With Titanium Mid Pipe 041438
Natural Titanium With Titanium Mid Pipe 042257
Natural Titanium With Titanium Mid Pipe 043348
Natural Titanium With Titanium Mid Pipe 044428
Aluminum With Stainless Steel Mid Pipe 044399
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap and Side Panel 041525
Blue Anodized Titanium and Side Panel/ Fitment 21 041526
Natural Titanium With Titanium Mid Pipe and Side Panel 041527
Aluminum With Stainless Steel Mid Pipe 041517
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 045586
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 042330
Natural Titanium With Titanium Mid Pipe 042331
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 042333
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 044400
Aluminum With Stainless Steel Mid Pipe 045557
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 045558
Natural Titanium With Titanium Mid Pipe 045559
Aluminum With Stainless Steel Mid Pipe 045566
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 045567
Natural Titanium With Titanium Mid Pipe 045568
Blue Anodized Titanium With Titanium Mid Pipe 045569
Blue Anodized Titanium With Titanium Mid Pipe And Carbon Fiber End Cap 045570
Aluminum With Stainless Steel Mid Pipe 045593
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap 045594
Natural Titanium With Titanium Mid Pipe 045595
Blue Anodized Titanium With Titanium Mid Pipe 045596
Aluminum With Stainless Steel Mid Pipe And Carbon Fiber End Cap N/A
Natural Titanium With Titanium Mid Pipe N/A
Anodized Blue Titanium With Titanium Mid Pipe And Carbon End Cap N/A
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