FMF Factory 4.1 Complete Exhaust With Stainless Hi-Flo Header

FMF Factory 4.1 Complete Exhaust With Stainless Hi-Flo Header
FMF Factory 4.1 Complete Exhaust With Stainless Hi-Flo Header

$269.99 $299.99
10% Off - Save $30.00

  • Description
  • 10 Reviews
  • 13 Questions
  • Fitment
Description Item #FMF000H

The Factory 4.1 system will give you a noticeable increase in all around power, and also shed some weight from your machine. Superior power on stock and big bore motors and the centralized mass improves handling.

FMF takes fun seriously, so they built the Mini Factory 4.1. This is an all out performance exhaust for play bikes. With the Mini Factory 4.1, you will be the king of backyard motocross and look great doing it!

  • The lightest available.
  • Superior power on stock and big bore motors.
  • Patented Chamber Core for optimum performance.
  • Engineered for compactness and centralized mass.
  • Exclusive mounting design.
  • Easily serviced for re-packing.

Detailed Specifications:

  • Type: System.
  • Construction: Titanium.
  • Finish: Natural.
  • Header construction: Stainless steel.
  • Header type: Hi-Flo.
  • Weight: 3.3 pounds.

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

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10 Reviews
4.6 out of 5 stars
5 Star   8 4 Star   3 3 Star   1 2 Star   0 1 Star   0
Verified Purchaser
kannapolis nc

really easy to install! My kid was smiling ear to ear when he heard his new bike.

Verified Purchaser
Medina, Ohio

I love this exhaust system!

San Jose, CA

Great price, fast shipping, super easy install just don't forget spark arrestor if in cali.

Osage Beach, MO
Pipe works but some problems

Bought this pipe for a 2012 KLX110L. It's advertised as being made for the bike, but I suspect it's really made for the older model KLX110. It's easy to install and bolts right up, but when you put the plastic back on, you'll find that the pipe pushes up against the plastic side plate at its front edge. When you ride, it melts the plastic there. In addition because the pipe is completely straight as it runs back, your right boot will get melted against the side of the pipe. Don't think you'd want to ride with just sneakers and shorts on!

Sounds good, and there's an obvious improvement in throttle response and acceleration.

Hot Springs, AR
Great Sound and Great Power

Put this on my yz250f and was expecting only the best when spending 600 on an exhaust. Let me tell you. Best investment I could have made. Gives the bike a completely different sound and you can feel the power it adds on. You get what you pay for. Couldn't be more happy.

Top 100 Contributor
Pittsburgh, PA
Durability   Ease of Installation   Performance   Power   Style  
Best Exhaust Ever

I have this set up on my 06 yz250f and it is absolutly amazing. The power gain from it is definitely noticeable over the stock exhaust. Fmf is the only way to go for the best performance exhausts out on the market. This exhaust system also gives the bike a different look. This is a great buy for your bike if your looking to add some more power to your bike.

Durability   Ease of Installation   Performance   Power   Style  
Good Pipe!

Great power everywhere gives it a nice sound to it

Durability   Ease of Installation   Performance   Power   Style  
Fast shipping

bought for a2008 crf 450 stronger mid-range revs a little longer on top .fit with no problems did not have to rejet

springfield, IL

easy install and sounds great, it added quite a bit of power and had a noticable difference up top but seemed to bog a little down low with the stock jets and airbox

Eastern Shore, Virginia
Awesome pipe! Very smart purchase.

added more power + increased overall performance.

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13 Questions
Answered:   13
Not Yet:   0
Q: Do you have any exhaust for a 2004 ttr 125?
3 months 7 days ago
MotoSport Staff Expert
3 months 6 days ago
A: Yes. Just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct exhaust for your bike. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Location: Pa
Q: Which exhaust would you recommend for a 2008 ttr 125l? The powercore4 or the factory 4.1?
1 year 5 months ago
Expert MotoSport Staff
1 year 5 months ago
A: Both are great pipes and you most likely will not be able to tell much of a difference in performance between the two on the 2008 TTR125L. The Powercore4 does come with the Integrated spark arrestor where as the on factory 4.1 the spark arrestor is sold separately.
Location: West Chester, PA, USA
Q: What should i rejet my 2015 klx110l to of i get the FMF Factory 4.1 exhaust?
1 year 10 months ago
I have a 2015 klx110l and it is all stock and I'm looking to get the FMF Factory 4.1 exhaust. I was wondering if the jets come with the bike or if i have to get them separately and if i do get them separately then what do i get?
MotoSport Staff Top 1 Contributor Expert
1 year 10 months ago
A: Jets are sold separately. 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.
Location: Mississauga
Q: Will this exhaust fit a Lifan 110 cc motor ? Thanks?
2 years ago
Expert MotoSport Staff Top 1 Contributor
2 years ago
A: No, unfortunately we don't carry any exhaust systems that will work with Lifan motors.
Q: Fitting for a 2013 KLX 110?
2 years 6 months ago
Hi, I have a couple of questions. 1. Does this fit perfectly on a 2013 Kawasaki KLX110 (not large wheel), as I have read some reviews that it caused the plastic's to melt as it wasn't a perfect fit. 2. Is this all that I need to order for a swap out, i.e. not other parts are required to fit. Thanks in advance Jason
MotoSport Staff Expert
2 years 6 months ago Location: Portland, OR, USA
A: Yes this exhaust is made to directly fit to your 2013 Kawasaki KLX110 and there should not be anything extra required to mount it up to your bike. As far as the plastic melting, the muffler on this exhaust is a bit larger than the OEM muffler and may come closer to the side panel than the OEM muffler. I would recommend purchasing some adhesive heat shielding to put on the inside of the side panel plastic to keep the plastic from melting.
Location: Sydney NSW, Australia
Q: Do you stock the quiet core for a 2009 Yamaha TTR125-L FMF 4.1 Factory exhaust I already have?
Over 3 years ago
Looking to quieten the pipe down.
MotoSport Staff
Over 3 years ago Location: Portland, OR, USA
A: FMF does have a quiet core insert available for this exhaust. Although we currently don't have it in stock, it is an item we can get. Please feel free to give us a call if you are interested in seeing about ordering. 1-888-676-8853
Q: Will this work on an orion pit bike?
Over 6 years ago
Will this work on an orion pit bike?
MotoSport Staff Expert
Over 6 years ago Location: Motosport
A: Sorry we do not carry parts for orion pit bikes.
Q: Is Motosport honoring the FMF 20% discount?
Over 6 years ago
MotoSport Staff
Over 6 years ago Location: Tualatin
A: we sure are, it is already included in the prices.
Top 100 Contributor
Location: Scotts Valley, CA
Q: Does it come with a spark arrestor?
Over 6 years ago
Over 6 years ago Location: East Hampton, NY
A: All aftermarket exhaust comes with installed spark arrestor. To comply with varying rules for riding on state land and such places like it. Very good system, installed not to long ago on a yz250f. Very good overall performance
Q: Does it come with a spark arrester?
Over 6 years ago
MotoSport Staff Expert
Over 6 years ago Location: Portland, OR
A: This does not include a spark arrestor.
Over 6 years ago
A: No it comes with just the pipe.
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