FMF Factory 4.1 Titanium Slip-On RCT - Blue [obs]

FMF Factory 4.1 Titanium Slip-On RCT - Blue [obs]
FMF Factory 4.1 Titanium Slip-On RCT - Blue [obs]

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Description See Also: 31 Reviews 34 Questions
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31 Reviews
4.6 out of 5 stars
5 Star   35 4 Star   3 3 Star   0 2 Star   0 1 Star   0
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All Reviews
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 Titanium Slip-On RCT - Blue [obs]
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 - Blue [obs]
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 - Blue [obs]
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 - Blue [obs]
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 !

See 11 More Reviews
34 Questions
Answered:   31
Not Yet:   3
noah
Location: Cold Spring, MN 56320, USA
Q: Will this fit my 2010 yz250f stock header?
1 month 11 days ago
72Honda
Location: South africa
Q: Will my 2015 CRF450R single fmf slip-on exhaust fit on a 2017 CRF450R?
1 month 25 days 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?
2 months 5 days ago
Riaan
Location: Chester mt
Q: Will the 2016 fc450 pipe fit the 2017 fc 450?
Over 6 months ago
Motoman59
Over 5 months ago
A: Yes
Jamesrides
Location: Blue Grass, IA 52726, USA
Q: Fitment(2011 kx250f)?
Over 7 months ago
Could i put this on my 2011 kx250f without the fmf head pipe using a stock headpipe
MotoSportExpert
MotoSport Staff Expert
Over 7 months 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 11 months ago
MotoSportExpert
Expert MotoSport Staff
Over 11 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 ago
DJ05
Over 11 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 1 month ago
MotoSportExpert
MotoSport Staff Expert
1 year 1 month 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 2 months ago
MotoSportExpert
Expert MotoSport Staff
1 year 2 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 2 months ago
MotoSportExpert
MotoSport Staff Expert
1 year 2 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.
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