FMF Fatty Pipe - 2-Stroke

Amazing power and sound, came is the best shape.

Really woke up power across the board. I was most suprised with the added low end grunt. With some clutch play I can crawl through some gnarly single track I couldn't before. Highly reccomend.

We have run these on all of my son's Kawasaki race bikes, love the sound and the increase in power.

Bought this for my sons Ktm 65sx. The stock pipe sounded like a skill saw and had a narrow powerband. The Fatty pipe changed the power and sound tremendously. I'm talking a true 2-stroke sound now with this pipe instead of the stockers annoying buzz. Add the powercore silencer and it gets even better.

i got this pipe for my 1998 cr250 when it came in the box was in bad shape but the pipe was excellent other than a minor scratch on the pipe good product

I bought this pipe hoping to get some low end torque for my 2017 YZ125 which in stock form is non existent. At $215.00 it isn't a bad price for what you get, I went ahead and got the Moose pipe guard to help protect my investment which put my total up to $350.00.
I already had a FMF Powercore 2 silencer so I thought mounting the pipe would be easy... WRONG.
The mounting points did not want to line up at all. I finally got it on going from front to back not tightening the bolts down all the way and it still took everything i had to get the silencer bolt in.
When I rode the bike for the first time I immediately felt the low end grunt i had been hoping for.
It was far better than I had imagined.
I did not have to re jet my carb. If your bike is jetted correctly you shouldn't have to re jet.

Great pipe, noticed more low end torque with my kx250 and it looks great to. You will need to reject your carbs but no big deal.

Bought for KX85.. We dig it! Great power gains throughout and a good deal!

Awesome pipe, installed it pretty easy. Made a huge difference in my power-band (I ride a 96kx125). Glad I bought this.

( 99 cr250 ).
YOU MUST RE-JET both MAIN (178) and PILOT (42) jets and check your needle clip position (2nd) after installing this pipe. FMF has a convenient drop down menu for application selection.. If you do not rejet you will flood your motor out trying to start it AND you'll run WAAAAY too rich. I went from SST to the FATTY. Low end torque is PHENOMINAL!! felt like i was on a 4 stroke while crawling thru the woods. i kept going lower and lower on RPMs in the woods, it would not flame out on me, WOW! You will lose some of the top end, not for drag racing. HOWEVER, I am still tinkering with my jetting, I'm using stock silencer with fatty pipe.