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FMF Factory Fatty Pipe
FMF Factory Fatty Pipe

$215.99 - $224.99
10% Off - Save up to $25.00

Item #FMF00E4

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39 Reviews
4.7 out of 5 stars
5 Star   33 4 Star   3 3 Star   1 2 Star   0 1 Star   2
All Reviews
Buddz94 Verified Purchaser
1 month 6 days ago Baltimore, MD
Durability4/5Ease of Installation5/5Performance5/5Power5/5Style5/5
Great performance

I bought this product about a month ago and absolutely love it. I went with the factory finish and it looks amazing. Noticeable power increase throughout the entire power delivery. Sounds great too!

Kaleb826 Verified Purchaser
1 month 26 days ago MI
Durability1/5Ease of Installation5/5Performance5/5Power5/5Style5/5
Didt last

I bought this a month ago and it’s rusting like crazy, i emailed Motorsport.com but no ones answering, if you want to good looking clean the pipe I do not recommend this one

2 months 17 days ago San Diego, CA
Go Pro Circuit

I received my pipe in the mail and it had all kinds of scratches, and had already began to rust. It had looked like a used pipe already. To top it all off, the mount didn't even line up properly. Paying $225 for a pipe I definitely wasn't satisfied and got my money back. Hello Pro Circuit ;)

Bobo Mac Verified Purchaser
4 months 17 days ago Greensburg pa
Durability3/5Ease of Installation5/5Performance5/5Power5/5Style3/5
Great pipe if you like rust.

Good fit good sound and performance but when we got it out of the box it was rusty. Should have returned it but cleaned it off and used it. Looks bad .sounds good.

Spence34 Verified Purchaser
4 months 21 days ago Peru IL
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5
Bolts right up no issues

Makes the bike sound awesome seems like the boy like the power as well

Buckx6504 Verified Purchaser Top 1000
Over 6 months ago Maricopa AZ
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5

This pipe looks great. After clear coating it with clear header pain and curing it in the oven so it will never rust on me this pipe looks amazing

King77 Verified Purchaser
Over 6 months ago
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5

Great pipe fits awesome . Looks dope . And made the bike sound good again

Ward Verified Purchaser
Over 8 months ago Charlotte
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5
Beta XTRAINER with Fatty Pipe

I had originally purchased the Gnarly pipe based on recommendations in Facebook, etc. However, I experienced that the Gnarly pipe just turned the XTRAINER into a beast. I just was looking for a bit more power on top (the low end was fine) so I decided to try the Fatty. Perfect pipe for my style of riding. Have the nice smooth torque as before and a bit more power on the upper RPMS. Also note that if you decide to get a P3 Carbon Pipe protector, the Gnary and Fatty use the same one PN 109061

Power Curve mx Top 100 Verified Purchaser
Over 8 months ago Nj
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5
Awesome pipe

Very well-built pipe !

Over 10 months ago Kahuku,Hi
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5
Solid performance and looks

So happy with this purchase

See 10 More Reviews
24 Questions
Answered:   22
Not Yet:   2
Q: Will this fit and replace an OEM pipe on a 2020 KTM 150sx?
2 months 17 days ago
Top 10
2 months 17 days ago
A: I found that the original pipe on the new 2020 KTM 150SX is the same as on the 2019 model. If your order the FMF Factory Fatty Pipe for a '19 150SX it will fit your 2020. Order at this link: https://www.motosport.com/fmf-factory-fatty-pipe?mmy=ktm;150sx;2019&mmy_source=pdp
Q: So I have a 2019 yz250x if I run this pipe with the turbine core 2.1 silencer would i need to change my jetting
Over 5 months ago
Top 10
Over 5 months ago
A: I would recommend checking the jetting when installing a full exhaust on your bike.
Q: Does this fatty pipe work with a fmf power core exhaust? 
Over 7 months ago
Top 10
Over 7 months ago
A: Yes this will work with a powercore slip on.
Q: Will this fatty pipe work with a full fmf turbo core exhaust? 
Over 7 months ago
Top 10
Over 7 months ago
A: yes this will work with a turbine core silencer.
Q: What is the difference between the sizes?  Cause you can’t big bore a kx100 with a kit
1 year ago
Q: Can I use the ktm 85 sx sxs cdi with this pipe
2 years 8 months ago
Can I use the ktm 85 sx sxs cdi with this pipe? The cdi says it's made to run with the stock exahust
Q: Can I put the pro circuit r304 silencer on this pipe on a kx100?
2 years 11 months ago
MotoSport Staff Expert
2 years 11 months ago
A: Fitment between manufactures can not be guaranteed. With that said you shouldn't have an issue.
FMF Factory Fatty Pipe
Q: Pipe fitting into YZ Stock silencer
Over 3 years ago
I have a 2013 YZ-125 and cant afford the pipe and silencer at the same time and need to do it in stages. If I get the pipe first, will it fit into the stock silencer?
MotoSport Staff Expert
Over 3 years ago
A: You should have no problems running the stock silencer with this pipe on your 2013 Yamaha YZ125.
Q: Would this fit my dep silencer?
Over 4 years ago
Would I be able to use this expansion chamber with my dep silencer of would it have to all be fmf?
MotoSport Staff Expert
Over 4 years ago
A: Most likely it will work but fitment can not be guaranteed with that combo.
Q: Will the SST,the Factory Fatty, or the Fatty be the one that is easiest to keep clean
Over 4 years ago
Expert MotoSport Staff
Over 4 years ago
A: The nickel-plated finish on the SST and Fatty pipes will be easier to clean and maintain than the bare finish on the factory pipes.
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# Part Numbers
Product Variant Manufacturer Part #
FMF Factory Fatty Pipe 021051
FMF Factory Fatty Pipe 021043
FMF Factory Fatty Pipe 021055
FMF Factory Fatty Pipe 025076
FMF Factory Fatty Pipe 025121
FMF Factory Fatty Pipe 025072
FMF Factory Fatty Pipe 025133
FMF Factory Fatty Pipe 025101
FMF Factory Fatty Pipe 025103
Standard 025090
FMF Factory Fatty Pipe 022062
FMF Factory Fatty Pipe 023058
FMF Factory Fatty Pipe 023043
FMF Factory Fatty Pipe 024052
FMF Factory Fatty Pipe 024056
FMF Factory Fatty Pipe 024039
FMF Factory Fatty Pipe 022032
FMF Factory Fatty Pipe 022055
FMF Factory Fatty Pipe 025183
FMF Factory Fatty Pipe 025198
FMF Factory Fatty Pipe 025161
For Supermini 025154
FMF Factory Fatty Pipe 025157
Big Bore 022063
FMF Factory Fatty Pipe 025204
FMF Factory Fatty Pipe 022064
Standard 025222
Big Bore 025224
FMF Factory Fatty Pipe 024069
Factory Fatty 025239
FMF Factory Fatty Pipe 025243
Factory Fatty Rev Pipe 025240
FMF Factory Fatty Pipe 025217
FMF Factory Fatty Pipe 024073
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.