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FMF Gnarly 2-Stroke Pipe
FMF Gnarly 2-Stroke Pipe

$224.99 - $251.99
10% Off - Save up to $28.00

Item #FMF00E5

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68 Reviews
4.8 out of 5 stars
5 Star   58 4 Star   8 3 Star   0 2 Star   1 1 Star   1
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All Reviews
Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Excellent Quality

This pipe paired with FMF spark arrester is a winning combination.
It smoothed out the hit and provides impressive low and midrange power without sacrificing top end.

Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Great fit sounds good

Fast shipping. perfect fit.

Verified Purchaser
Platte City Mo.
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Great fit

It fits KTM but the cooling lines are really close to the exhaust now. Love the sound and the power is great as well.

Verified Purchaser
Bloomsburg, PA 17815, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Great pipe

Definitely a low end power type of pipe. The increased thickness of the metal was much appreciated.

Verified Purchaser
SW Florida
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5

Thanks guys for the fast service. I had a FMF Fatty on my yz250 thought the Grarly might calm it down some. Still scary fast lost a little top end.

Verified Purchaser
Denton, TX
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Exactly what I wanted

Have been running a painted pro-circuit pipe and their silencer but wanted a spark arrestor as well. My pipe had various sized dents and dings so I chose to go with the FMF(it was in stock) pipe and spark arrestor silencer. Both arrived scratch free. Installed with no issues and look great, perform with no noticeable difference from the pro-circuit unit. I'm happy with the purchase.

Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Favorite pipe for 250sx

I've had a couple different pipes on my 250sx and this is my favorite for trail riding, the low down torque is hard to beat.

Western Oregon
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
This pipe is great

I ride a 17 xtraner 300 and was a little hesitant to weather this pipe would be as good down low as the factory pipe. I ride mostly WET, MUDDY, ROOTY, STEEP ground and the grunt and tractability of the 300 is super important to me. The Gnarly did not disappoint this thing is.
1: better built then the factory pipe
2: chugs just as good as the factory pipe
3: the mid and over rev. are noticeably better

Santa Rosa CA
Durability 4/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 4/5

After destroying my old fatty pipe on my practice bike i wanted to change it up with the gnarly and it’s awesome! For the trails it has super good low end and is also great on the track

Verified Purchaser
Oregon, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Best pipe ever

The gnarly fmf pipe is amazing, added low end torque for my enduro riding on my yz250 2 smoker and takes lots of abuse and hold up to being hit on trees and rocks. Ive owned the both the fatty and the gnarly and all of fmfs pipes are great. Only problem is the coating is not the greatest and after going to the dunes for one day it started rusting, but nothing some steel wool and wd40 cant fix.
As always fast shipping, thanks motosport!

See 10 More Reviews
27 Questions
Answered:   26
Not Yet:   1
Q: Will this pipe fit an 01' yz 125?
Over 7 months ago
Looking for a good woods pipe with a good crawling low end and durability. Only to find it doesn't fit my bike, any alternatives or mounting options for my bike?
Top 10 Contributor
Over 7 months ago
A: FMF only offers the Fatty pipe for your 2001 YZ125
Q: Is there a silencer sold for this pipe?
Over 9 months ago
I’m buying this for my 1986 cr500 and want to know if there’s a silencer that fits it
Top 25
Over 9 months ago
A: Sorry to inform you that FMF now long manufactures a silencer for the 86 cr500 and I no longer have access to an oem replacement.
Q: 1998 cr 250 two stroke
1 year 7 months ago
Gnarly pipe and shorty silencer 14/51 gearing what would the Power be like
Q: Will the FMF Gnarly fit with the stock silencer?
1 year 11 months ago
Expert MotoSport Staff
1 year 11 months ago
A: You shouldn't have a problem running the FMF Gnarly pipe with the stock silencer.
Q: Is it necessary to rejet / adjust the carbie after fitment to get this lower rpm power?
2 years ago
MotoSport Staff Expert
2 years ago
A: Yes. You should always properly tune your bike after getting an aftermarket exhaust to allow it to run at its optimal level and give you the most performance. Failure to properly tune your bike will void your warranty.
Due to the variations that may come into effect when tuning an engine (i.e. pipes, intake, altitude, cams, displacement, standard or high compression pistons, etc.) we CANNOT offer jetting recommendations.
2 years ago
A: You would have to adjust the jetting to compensate for this pipe-if you don't then it probably won't run smoothly.
Q: I have a 2013 ktm 250sx with a FMF shorty silencer on it with stock exhaust. Will the gnarly pipe bolt right up to the shorty silencer? And also what
2 years 1 month ago
Expert MotoSport Staff
2 years 1 month ago
A: Yes, you would have not problem matching the FMF Gnarly with the FMF shorty silencer. FMF designs their pipes to fit with their silencers.
Q: I have 2000 kx 250 2 stroke already have the powercore 2 silencer. Will that silencer match up with the gnarly pipe and fit this bike.
2 years 1 month ago
I have the FMF sst pipe now and the powercore 2 was to big (long) and did not fit with this pipe. I want to get the pipe that will fit with this silencer. (powercore 2)
Expert MotoSport Staff
2 years 1 month ago
A: Yes, FMF designed its pipes to fit FMF silencers.
Q: Does this ship with new O ring gaskets?
2 years 2 months ago
MotoSport Staff Expert
2 years 2 months ago
A: You would be able to use the same O-Ring Gaskets as the OEM pipe uses. The O-Rings for your pipe can be found in the OEM parts section.
Q: Will this affect the top end or the power band negatively?
2 years 6 months ago
MotoSport Staff Expert
2 years 6 months ago
A: The Gnarly gives maximum low-end boost without sacrificing top end power.
2 years 6 months ago
A: I did not notice any top end power loss at all but did notice better bottom end grunt.
Q: Will this fit my 97 kx250 ? And what kind of adjustments would I have to do after installing?
2 years 7 months ago
Expert MotoSport Staff
2 years 7 months 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 pipe for your bike. Jetting changes would likely be needed. . 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. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
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# Part Numbers
Product Variant Manufacturer Part #
FMF Gnarly 2-Stroke Pipe 020379
FMF Gnarly 2-Stroke Pipe 021007
FMF Gnarly 2-Stroke Pipe 021041
FMF Gnarly 2-Stroke Pipe 020027
FMF Gnarly 2-Stroke Pipe 020028
FMF Gnarly 2-Stroke Pipe 021053
FMF Gnarly 2-Stroke Pipe 020024
FMF Gnarly 2-Stroke Pipe 020026
FMF Gnarly 2-Stroke Pipe 025143
FMF Gnarly 2-Stroke Pipe 020080
FMF Gnarly 2-Stroke Pipe 025085
FMF Gnarly 2-Stroke Pipe 025087
FMF Gnarly 2-Stroke Pipe 020084
FMF Gnarly 2-Stroke Pipe 025131
FMF Gnarly 2-Stroke Pipe 025070
FMF Gnarly 2-Stroke Pipe 020083
FMF Gnarly 2-Stroke Pipe 025004
FMF Gnarly 2-Stroke Pipe 025023
FMF Gnarly 2-Stroke Pipe 020079
FMF Gnarly 2-Stroke Pipe 020082
FMF Gnarly 2-Stroke Pipe 020078
FMF Gnarly 2-Stroke Pipe 020081
FMF Gnarly 2-Stroke Pipe 022007
FMF Gnarly 2-Stroke Pipe 022016
FMF Gnarly 2-Stroke Pipe 022041
FMF Gnarly 2-Stroke Pipe 020058
FMF Gnarly 2-Stroke Pipe 020059
FMF Gnarly 2-Stroke Pipe 022053
FMF Gnarly 2-Stroke Pipe 020038
FMF Gnarly 2-Stroke Pipe 023060
FMF Gnarly 2-Stroke Pipe 020110
FMF Gnarly 2-Stroke Pipe 020156
FMF Gnarly 2-Stroke Pipe 024054
FMF Gnarly 2-Stroke Pipe 020025
FMF Gnarly 2-Stroke Pipe 025152
FMF Gnarly 2-Stroke Pipe 020056
FMF Gnarly 2-Stroke Pipe 025010
FMF Gnarly 2-Stroke Pipe 025148
FMF Gnarly 2-Stroke Pipe 025203
FMF Gnarly 2-Stroke Pipe 25156
FMF Gnarly 2-Stroke Pipe 25172
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WARNING: This product contains chemicals known to the State of California to cause cancer, and birth defects or other reproductive harm. Wash hands after handling. For more information, go to