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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61 Reviews
4.8 out of 5 stars
5 Star   51 4 Star   8 3 Star   0 2 Star   1 1 Star   1
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All Reviews
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 Top 1000 Contributor
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!

Top 1000 Contributor Verified Purchaser
Lenoir, NC, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
FMF Gnarly on my 1998 KX 250

Right out of the box application with no additional re-jetting required since I had a previous FMF on the bike. Even being 227 lbs, I immediately noticed a big difference in the low end power while riding the Brushy Mountain Trails. The extra thickness is a bonus too! FMF forever!

Verified Purchaser
Chesapeake, VA, USA
Durability 5/5 Ease of Installation 4/5 Performance 5/5 Power 5/5 Style 5/5
For my KX500

I put it on fairly quick and it looks and sounds great. Thanks Motosport!!

FMF Gnarly 2-Stroke Pipe
MotoSport Staff Expert Verified Purchaser
Portland, OR, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Great performance

Really happy with the look, performance and sound this pipe added.

Verified Purchaser
Oakhurst CA.
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Single best performance part my bike has

Currently ride a 2002 cr 250. This pipe turned my bike into a tractor.
Can lug the thing for days and it still lifts the front tire no problem. Have riden two strokes most of my riding career and have always ran fmf exhaust so I had no doubt this would be good, but this thing is great.

Bristol, VA, USA
Durability 4/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Can't go wrong with FMF

I bought this pipe for my 07 RM 250. I use this along with a FMF Shorty silencer. This was actually bought to replace the exact same pipe. I have always ran the FMF Gnarly on my bike and it performs excellent. The low end power really came alive after installing this pipe and I don't think the top end lost any power at all. With this pipe, my power band hits like Mike Tyson. There was a small learning curve at first but within about 20 minutes I felt comfortable again. I mainly ride on woods trails and this pipe is perfect for that. Like any 2 stroke expansion chamber, this thing really sticks out and takes a lot of abuse when the bike is wrecked. Like I said, I bought this as a replacement for the exact same pipe as I cracked my FMF pipe this past weekend riding on a motocross track in Eastern Tennessee. I really didn't wreck super hard but this wasn't the first time I wrecked on that same side so it is possible that I just kept hitting that same spot until it became really weak and finally cracked. I'm not too upset though. Until this weekend, the pipe performed flawless

MotoSport Staff
portland or
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Breathed a whole new life to my KDX200

She's a beast now! Really opened her up. Lots more power and throttle response. Checked the FMF site for jet suggestions and all I have to do was swap out the carb needle. Love the new pipe. Every two stroke should have one!

Verified Purchaser
Nort Carolina
Ease of Installation 4/5

Bought the Gnarley after the stock pipe on my 2016 Husq TE300 got dinged up pretty bad. This pipe makes power down low. I road one exclusively on my previous bike as it came with it used (EXC 300 KTM from 2005).

My Husqvarna already had lower end power, but the new pipe seems to allow me to run 3rd gear more on the tigher trails I ride as opposed to 2nd gear. Churns out more power in 3rd and does not stall (I lug my 300 mainly, but do get on the pipe on occasion).

Good looking pipe and should take more abuse than the stock pipe due to the thicker diameter steel.

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27 Questions
Answered:   26
Not Yet:   1
Q: Will this pipe fit an 01' yz 125?
2 months 17 days 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
2 months 17 days ago
A: FMF only offers the Fatty pipe for your 2001 YZ125
Q: Is there a silencer sold for this pipe?
4 months 24 days ago
I’m buying this for my 1986 cr500 and want to know if there’s a silencer that fits it
Top 10 Contributor
4 months 24 days 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 2 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 6 months ago
MotoSport Staff Expert
1 year 6 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?
1 year 7 months ago
Expert MotoSport Staff
1 year 7 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.
1 year 7 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.
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
1 year 8 months ago
Expert MotoSport Staff
1 year 8 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.
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.
1 year 8 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)
Expert MotoSport Staff
1 year 8 months ago
A: Yes, FMF designed its pipes to fit FMF silencers.
Q: Does this ship with new O ring gaskets?
1 year 9 months ago
MotoSport Staff Expert
1 year 9 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 ago
Expert MotoSport Staff
2 years ago
A: The Gnarly gives maximum low-end boost without sacrificing top end power.
2 years 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 1 month ago
Expert MotoSport Staff
2 years 1 month 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 020391
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 N/A
FMF Gnarly 2-Stroke Pipe N/A
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