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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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71 Reviews
4.7 out of 5 stars
5 Star   60 4 Star   8 3 Star   0 2 Star   1 1 Star   2
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All Reviews
Verified Purchaser
Greensboro N.C
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Can't go wrong choosing Fmf products

I changed from a Fmf fatty to a Fmf gnarly and it's exactly what my Ktm 300 needed.Gave it a lot of pull from bottom end throughout the whole power range.

Verified Purchaser
White Salmon, WA
Durability 4/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Nice power delivery!

I really like how this pipe changed the power delivery on my bike! The quality is awesome and it was easy to install.

Durability 4/5 Ease of Installation 1/5 Performance 4/5 Power 4/5 Style 4/5
Poor fit for ktm 200 exc

I purchased this pipe for a customer for a 06 ktm 200xcw and it was very poor fitting. The only way i got it to fit was adding really long bolts and bolting it up very loosely and was super hard to get everything lined up

Verified Purchaser
California
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
BRAAAP

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
Michigan
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.

See 10 More Reviews
28 Questions
Answered:   26
Not Yet:   1
Josh
Q: I have a 94 honda cr250r .. will my stock muffler fit on to this pipe?
1 month 18 days ago
Mason
Q: Will this pipe fit an 01' yz 125?
Over 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?
David
Top 10 Contributor
Over 9 months ago
A: FMF only offers the Fatty pipe for your 2001 YZ125
Jace
Q: Is there a silencer sold for this pipe?
Over 11 months ago
I’m buying this for my 1986 cr500 and want to know if there’s a silencer that fits it
Motoexpert
Top 25
Over 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.
Lotcroc
Q: 1998 cr 250 two stroke
1 year 9 months ago
Gnarly pipe and shorty silencer 14/51 gearing what would the Power be like
Phil
Q: Will the FMF Gnarly fit with the stock silencer?
2 years 1 month ago
MotoSportExpert
Expert MotoSport Staff
2 years 1 month ago
A: You shouldn't have a problem running the FMF Gnarly pipe with the stock silencer.
lovemyktm
Q: Is it necessary to rejet / adjust the carbie after fitment to get this lower rpm power?
2 years 2 months ago
MotoSportExpert
Expert MotoSport Staff
2 years 2 months 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.
HwKennedy
2 years 2 months 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.
Blake
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 3 months ago
MotoSportExpert
Expert MotoSport Staff
2 years 3 months 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.
Stevie
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 3 months 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)
MotoSportExpert
Expert MotoSport Staff
2 years 3 months ago
A: Yes, FMF designed its pipes to fit FMF silencers.
Timothy
Q: Does this ship with new O ring gaskets?
2 years 4 months ago
MotoSportExpert
MotoSport Staff Expert
2 years 4 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.
http://www.motosport.com/dirtbike/oem-parts
Jordan
Q: Will this affect the top end or the power band negatively?
2 years 7 months ago
MotoSportExpert
Expert MotoSport Staff
2 years 7 months ago
A: The Gnarly gives maximum low-end boost without sacrificing top end power.
Ktm250sx
2 years 7 months ago
A: I did not notice any top end power loss at all but did notice better bottom end grunt.
1 - 10 of 28
Fitment

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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
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.