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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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93 Reviews
4.7 out of 5 stars
5 Star   76 4 Star   10 3 Star   2 2 Star   2 1 Star   3
All Reviews
6 days 12 hours ago Redding ca
Durability5/5Ease of Installation4/5Performance5/5Power5/5Style5/5
Awesome pipe.

Got for my 2003 cr250r and I love it fit great sounds good and is gonna work alot better then the smashed in fatty that was on it. Would have been a 5 star item except it was missing the pre welded on nutcert on the rear of the pipe where it bolt by the exhaust pipe. Other then that looks great fit great runs great.

21 days ago Lincoln County NC
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5
I love it !!!!!

This is the only pipe I use on my 1996 RM250. I took my Fatty off and the rest is history.

Mx222 Verified Purchaser
29 days ago Oregon
Durability4/5Ease of Installation4/5Performance4/5Power4/5Style5/5
The Standard

Same power characteristics as the widely utilized "Fatty." Manufactured out of thicker steel, the added weight in lieu of increased durability is a compromise I'm always willing to make. Long live Flying Machine Factory.

Single trackin Top 1000 Verified Purchaser
3 months 3 days ago Gilcrest Colorado
Durability4/5Ease of Installation4/5Performance4/5Power4/5Style4/5
Come on you guys

Seems as though fmf quality isn’t what it used to be sloppy and rusty welds on a brand new pipe and Motorsport folks loosely packed it in a box with my new bike stand got a rusty scratched and dented brand new pipe looks like I’ve been running this pipe for over a year

hcc104 Verified Purchaser
3 months 14 days ago Central Florida
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5
Great pipe.

Have used this pipe on all our bikes for years. They work great for hare scrambles and hold up well.

3 months 16 days ago
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5
For 17 Ktm 300xcw

Awesome pipe for beefy low end torque and midrange. Still has a strong top but not as strong as fatty when compared back to back. Midrange hits stronger than fatty. Awesome pipe.

Geezer Verified Purchaser
3 months 23 days ago East/Central Kentucky
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5
Donny Emler has yet another winner.

Compared to the pipe I had been using, this pipe definitely added bottom and mid-range punch. The grunt at really low rpm is very comparable to an RFS 4T, you just have to be very judicious with the throttle when searching for traction as any snap wiil breakit loose.

I also found that when re-jetting was corrected that there was little noticable loss to the top end power. Short shifting quickly through the gearbox under heavy throttle can be a near short-staining experience, so you really dont need a shreiking over-rev.

The bike is a 2013 Husaberg TE300 with an SX head and SX ignition, RB Designs carb and a 5 oz. Steahly flywheel.

Rider47 Verified Purchaser
Over 5 months ago North Texas
Durability4/5Ease of Installation5/5Performance5/5Power5/5Style5/5
Nice Pipe!!

Bought this to go with the RB head and carb mods, really woke the bike up, has more usable power throughout the RPM range. Sounds good too!

Rudy Verified Purchaser
Over 5 months ago Kauai, Hawaii
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5
Looks great


Blais 1960 Verified Purchaser
Over 5 months ago Port Charlotte Florida
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5
Excellent pipe great power and durability

I have owned several of these pipes and have never been disappointed

See 10 More Reviews
30 Questions
Answered:   27
Not Yet:   3
Q: On a 2019 ktm 300xc-w tpi would this pipe work well on an otherwise stick engine?
Over 7 months ago
Top 10
Over 7 months ago
A: Yes, we have the FMF Gnarly 2-Stroke Pipe in stock for your 2019 KTM 300XCW TPI .
This FMF Gnarly gives maximum low-end boost to your stock engine.
Q: With this fit my 1999 yz250 two stroke?
Over 7 months ago
Q: I have a 94 honda cr250r .. will my stock muffler fit on to this pipe?
1 year 1 month ago
Q: Will this pipe fit an 01' yz 125?
1 year 9 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
1 year 9 months ago
A: FMF only offers the Fatty pipe for your 2001 YZ125
Q: Is there a silencer sold for this pipe?
1 year 11 months ago
I’m buying this for my 1986 cr500 and want to know if there’s a silencer that fits it
Top 25
1 year 11 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
2 years 9 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?
Over 3 years ago
Expert MotoSport Staff
Over 3 years 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?
Over 3 years ago
Expert MotoSport Staff
Over 3 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.
Over 3 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
Over 3 years ago
MotoSport Staff Expert
Over 3 years 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.
Over 3 years 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)
MotoSport Staff Expert
Over 3 years ago
A: Yes, FMF designed its pipes to fit FMF silencers.
1 - 10 of 30

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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 025156
FMF Gnarly 2-Stroke Pipe 025172
FMF Gnarly 2-Stroke Pipe 025242
California Proposition 65

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 www.P65Warnings.ca.gov.