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FMF Factory 4.1 Slip-On Exhaust - Natural Titanium With Titanium Mid Pipe

Retail: $399.99 - $549.99
$374.99 - $499.99
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Product Description

The FMF Factory 4.1 slip-on exhaust is the same exhaust that professional racers use to bring home championships around the world. FMF constructed the Factory 4.1 slip-on exhaust to offer the lightest weight slip-on on the market. The technology in this slip-on exhaust cannot be found in any other exhaust. The proprietary Chamber Core technology allows for smoother and more efficient exhaust flow to maximize the power output. Since the Factory 4.1 slip-on exhaust is meant to be used for competition, FMF made this pipe ready to take to the track straight out of the box. The FMF Factory 4.1 has been designed to allow for easy maintenance with a removable sleeve for repacking and it offers the ability to fine tune the performance of the exhaust with the addition of tuning inserts and the option of a spark arrestor to give you no boundaries.

  • The lightest system available.
  • Boosts low-mid torque and offers a broader powerband with more over-rev.
  • Patented Chamber Core for optimum performance.
  • Engineered for compactness and centralized mass for improved handling.
  • Exclusive mounting design.
  • Easily serviced for re-packing.
  • Slip-on mufflers are available with a titanium or stainless steel midpipe.
  • Customizable with performance tuning inserts and spark arrestor module.
  • Meets AMA® sound requirements on most models.

Detailed Specifications:

  • Type: Slip-On.
  • Configuration: Single.
  • Construction: Titanium.
  • Finish: Natural.
  • Midpipe: Titanium.
  • Endcap: Stainless steel.

Note: For closed course competition use only. Not intended for street use.

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(7)
4.9 out of 5 stars
5 star   6
4 star   1
3 star 0
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“ I have been running another brand of pipes on both of my CRF250Rs for just over a year now. ”
nmcrash01 Location: Peralta, nm
“ THIS PIPE RIGHT HERE IS A GREAT PIPE ALOT OF HORSE POWER IT GIVES YOUR BIKE. ”
SULLIVAN42 Location: CA.
1-7 of 7
Overall
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Ease of Installation
Performance
Power
Style
Verified Purchaser
This product combined with the power bomb header completely got rid of the throttle snap bog on my 2007 crf250r. Added tons of power on bottom and mid, would recommend to anyone lookin to get rid of the stock duals
Overall
Top 500 Contributor
Location: Peralta, nm
Big Difference
I have been running another brand of pipes on both of my CRF250Rs for just over a year now. I put a power bomb header with a 4.1 muffler on my '09 and WOW what a difference. Not only did it lower the sound, but the power increase was very real from bottom to top.
Overall
Great product...low to mid range gains
Overall
Durability
Ease of Installation
Performance
Power
Style
Location: The ZOO, Mi
Good pipe
Bought for 06 crf250r, already had the fmf megabomb on bike, fit good the only complaint i have is the tire (stock size) rubs the exhaust when suspension is compressed. makes good power and sound with the 94Db insert
Overall
Top 100 Contributor
Location: Pittsburgh, PA
Great Buy!
This is a great product for any bike. I have it on a 2006 yz250f and is absolutly amazing. It made it quieter and had shortened it about and inch to two inches. It also had made the throttle response on my bike quicker, before it had a little play in it now you turn it just a little bit and it is hitting. Absolutly worth every penny and well worth it to get the power and much, much more out of it.
Overall
Top 100 Contributor
Location: Yorba Linda, Ca
BEST PURCHASE EVER
the power is overall good i like the extra torque i get
Overall
Location: CA.
FMF
THIS PIPE RIGHT HERE IS A GREAT PIPE ALOT OF HORSE POWER IT GIVES YOUR BIKE. LOUD, LIGHT AND I PREFER ALL HONDA RIDERS TO GET THIS
1-7 of 7
Total Questions (7)
Questions with answers:
  7
Questions without answers:
0
Have a question?
“ Fit the stock header?... ”
Kawirider7 Location: Ky.
“ For a 2006 crf250r w/ the dual exhaust do i have to make any modifucations or does it just bolt direc... ”
hondacrf250r
“ Is it loud with just slip on?... ”
remund17
1-7 of 7
Kawirider7 Over 3 years ago Location: Ky.
Fit the stock header?
Hey does this fit the stock header? and also i read a question were someone was asking if it was"real loud" , i was wondering the same, and what i mean by that is, how much louder is it than a stock pipe by decibels?
Expert MotoSport Staff
Over 3 years ago Location: Portland, OR
This will fit the stock head pipe. The dB will be increased slightly depending on the type of bike it's being installed on. FMF do offer quiet cores to bring that sound level down to an acceptable limit.
Answer this Question
hondacrf250r Over 3 years ago
For a 2006 crf250r w/ the dual exhaust do i have to make any modifucations or does it just bolt directly off the header?
MotoSport Staff Expert
Over 3 years ago Location: Portland, OR
This will mount up to your stock header. This will convert your dual exhaust to a single exhaust system. this does include the mid pipe.
Answer this Question
remund17 Over 3 years ago
Is it loud with just slip on?
if i just put the slip-on on will it be as loud as it would be with a header too? if i just put slip-on on will it be real loud?
MotoSport Staff Expert
Over 3 years ago Location: Portland, OR
I'm not understanding what you mean by loud. This pipe will perform better than stock, and would be approx. 103Db out of the box.
Answer this Question
bonilla Over 4 years ago Location: Miami, FL
Is that a power bomb already installed?
this is the entire exhaust? end to top?
Expert MotoSport Staff
Over 4 years ago
this is a SLIP-ON exhaust system. You will not be getting the head pipe with just this. You can look into the full FMF exhaust systems if you're looking for the complete system.
Answer this Question
Top 100 Contributor
Bevo Over 4 years ago Location: Pittsburgh, PA
This already has the mid pipe with it correct? And the end cap just screws off correct? How does the spark arrestors go in?
Over 4 years ago Location: mammoth lakes
the pipe does have the mid pipe but the end cap on this model does not come off and the spark arrestor is already on the pipe all you to do is bolt it on ;)
Answer this Question
hondakid Over 5 years ago Location: stanwood,wa
Is this pipe 96db?
Expert MotoSport Staff
Over 4 years ago
This will not be 96dB out of the box. But they do offer 2 quiet insert that will lower the dB by -3dB or -5dB, depending on which one you get. These are sold separately.
Answer this Question
wessktm Over 5 years ago Location: springfeild mo
What header pipe do you need with this canister?
MotoSport Staff Expert
Over 5 years ago Location: Portland, OR
This exhaust can be used with either the OEM header or a FMF header. For optimum power increase I would suggest going with a FMF header. If there are any other questions give me a call, Jeremiah ext. 5713.
Answer this Question
1-7 of 7

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