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

$359.99 - $404.99
10% Off - Save up to $45.00

Item #FMF0003

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11 Reviews
4.4 out of 5 stars
5 Star   7 4 Star   2 3 Star   1 2 Star   1 1 Star   0
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All Reviews
Verified Purchaser
Southlouisana
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Looks great sounds even better

Bought the factory 4.1 with the stainless meg a bomb for my 06 yz250f also did the jd jet kit couldn’t be happier sounds great and runs great

Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
FMF 4.1

This exhaust sounds better then your mom mid power band. Feels greats and turns heads when flying by.

Verified Purchaser
Wisconsin
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Awesome exhaust

Really woke the bike up paired with the mega bomb header quality pipe easy instal and great sound

Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Awesome product

I love this fmf, adds lots of power and sounds great. Very easy to install which is good.

Durability 4/5 Ease of Installation 4/5 Performance 5/5 Power 3/5 Style 5/5
FMF

I got this as a Christmas present, it added plenty of power to my crf 150r and installing it wasn't that hard. If it broke which it hasn't after 2 years, I would defiantly buy it again.

FMF Factory 4.1 Slip-On Exhaust
Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 4/5 Style 4/5

Verified Purchaser
United States
Durability 3/5 Ease of Installation 1/5 Performance 3/5 Power 3/5 Style 5/5
Installation

I like the exhaust and power bomb header a lot! The only problem I had with this was installing it. It was a huge pain in the you know what. You have to buy your own clamps to secure the power bomb header to your exhaust. You also need to buy high temp silicone. This costs about $30, and you also have to let it sit for 24 hours for the best outcome. Other than that it took me about 30 minutes to take the old exhaust off and put the new one on. Hope this helps to future customers.

Verified Purchaser
Port Orchard, WA, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
FMF Factory 4.1 Slip-On Exhaust

Love this pipe! Was easy to install, sounds great, and excellent power increase. (I also installed a power bomb)

Elkhart indiana
It goes ham with the mega bomb

I like it it added lots of power I was riding on the road and went to full throttle for a race takeoff and my tires just got to spinning. Very good buy check my bike out on Facebook. scar ray is my name on there

las vegas
Ok

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14 Questions
Answered:   13
Not Yet:   1
Gowder147
FMF Factory 4.1 Slip-On Exhaust
Q: Dent on mid pipe 06-09 yz250f
1 year 9 months ago
On the side of the mid pipe on the side that is closest to rear shock there is a dent that is meant to be there to clear the spring or did I receive a bad mid pipe.
cait
Q: Would it fit a 2016/17 crf230f?
1 year 9 months ago
I'm getting a new dirt bike will highly likely get a 2016 crf230f or I might wait for the 2017 model and I want to mod it like crazy whichever bike I get thanks mate
Jake
Top 500
1 year 9 months ago
A: The FMF options for the 16/17 CRF230F is the powercore 4 and the Q4 Slip on exhaust!
bigeazyt
Q: Can you get a spark arrestor
1 year 10 months ago
MotoSportExpert
MotoSport Staff Expert
1 year 10 months ago
A: No, sorry.
Nonni
Q: KTm sxf250 2006
1 year 11 months ago
will fmf 4.1 fit on my stock header pipe??
MotoSportExpert
Expert MotoSport Staff
1 year 11 months ago
A: For the most part yes. FMF builds their systems 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.
Loganmx250
Q: Does this have a mid pipe, that would directly fit to the fmf powerbomb header?
Over 3 years ago
Does this have the mid pipe included
MotoSportExpert
Top 1 Contributor
Over 3 years ago
A: Yes, the FMF Factory 4.1 Slip-On Exhaust comes complete to mount to the header. feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Crashero923
Q: Old newer dual exhaust fit on older models?
Over 3 years ago
I have a 2006 crf250r and I was wondering if like the new dual exhaust slip on pipes made for the 2015 model would fit on my 2006? Or any after market dual exhaust pipes for that madder
MotoSportExpert
MotoSport Staff Expert
Over 3 years ago
A: No, the 2015 CRF250R exhaust will not work on the 2006.
ls1909
Q: What is the db rating for this exhaust without a spark arrestor or quiet insert?
Over 3 years ago
MotoSportExpert
Top 1 Contributor
Over 3 years ago
A: FMF does not have a db rating for the Factory 4.1 Slip-On Exhaust without the insert. FMF rates the insert as a 94db unit. .
zackry
Q: Would i need to re jet my carb from stock for this pipe and the powerbomb? i bought my bike with this pipe and a little smoke comes out occasionally?
Over 3 years ago
My 2008 yz450f came with this pipe on it and i recently added a powerbomb head pipe made by FMF and have great power gains. although i got my bike used it was in really good condition! but it puts out a little smoke? i was wondering if it is a jetting issue or oil getting past the rings on the piston. i checked my air/fuel screw and it was at 2 turns out from all the way turned in. ive always heard thats stock specs.. it takes a few kicks to crank but it runs strong!! please help ? does it sound more like it needs a new jet? if so which one and what size should i go with? or is it a piston and ring ? what little bit of smoke i see come out of my pipe looks blue and a friend of mine says it looks like it could be black..
MotoSportExpert
MotoSport Staff Expert
Over 3 years 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. I would recommend taking your bike to a local motorcycle dealership’s service department to have your bike properly jetted.
keifer151
Q: I have a FMF mega bomb header andd pipe i want to get the 4.1 factory pipe is there a way i can get just the 2 mufflers? for an 08 CRF250
Over 4 years ago
MotoSportRyanT
MotoSport Staff Expert
Over 4 years ago
A: From what I can find, FMF only would make the Factory 4.1 Slip-On in a single sided version for your 2008 Honda CRF250R. (http://www.fmfracing.com/Products/BikeAsList/2008_HONDA_CRF250R)
Vinny
Q: Does this slip on include one of these? http://www.motosport.com/dirtbike/FMF-4141C-Quiet-Core-Spark-Arrestor-Insert
Over 4 years ago
I need the insert that is both a spark Arrestor and a quiet core in one.
MotoSportRyanT
Expert MotoSport Staff
Over 4 years ago
A: This Slip-On would include a removable screen spark arrestor insert but it would not be the Quiet Core Spark Arrestor. You would need to purchase the Quiet Core Spark Arrestor Insert separately from the Slip-On.
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Fitment
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# Part Numbers
Product Variant Manufacturer Part #
Blue Anodized Titanium With Stainless Steel Mid Pipe 044235
Natural Titanium With Stainless Steel Mid Pipe 041157
Natural Titanium With Stainless Steel Mid Pipe 041171
Natural Titanium With Stainless Steel Mid Pipe 042061
Natural Titanium With Stainless Steel Mid Pipe 042101
Blue Anodized Titanium With Titanium Mid Pipe 041291
Natural Titanium With Stainless Steel Mid Pipe 044211
Natural Titanium With Stainless Steel Mid Pipe 044206