Choosing a pipe for the ATC-500R project

[Jason Hall]

Billy did you mess with the main jet when you tried that fmf pipe? If I was you Derrick I would spend the extra money & have one custom made to fit your exact riding style. Then you can use that outrageous power the way you want. I would'nt think you would want alot of top end, if you mx race it. Someone can make you a pipe that will make the low & mid range perfect, you don't want an explosive power band you want it to come on as smooth as you can. You might want to have your port work done first if your gunna, then have a pipe made.

[Billy Golightly]

Na, plug looked perfect. It was a fresh one too. Nice and tan/slight orange so I didn't mess with it any. I dunno, its probably the perfect pipe for the woods but not for drag racing. The lowend and midrange increase was noticeable but after that it just tapered off. It really was almost like riding a 4 stroke.

[Dammit!]

The "Gnarly" is FMF's low end/torque pipe isn't it?

[Billy Golightly]

Hmmm are the gold series and the gnarley's 2 different types of pipes? FMF and their damn terminology.

[NOS_350X]

Yup there diffrent pipes, I know the gnarly is a low end, and i'm perty shure the GS is a topend

[Dammit!]

I always thought the gnarly and fatty were both from their gold series. Always figured Gold Series reffered to the nickel plate finish or something. Never really thought about it.

Edit: Apparently the Fatty is the only one in the gold series. According to their web page there's the factory fatty and the gold series fatty. Difference just being the nickel finish. There's also the gnarly (low end/torque), the Rev (high end) and the sst (looks like slightly more top end than a fatty). This is current info however. Product line might have been different in the past. I could swear I remember seeing a gold series gnarly pipe in a catalog or something somewhere.

I've got the Fatty on my 250R and would say it's a decent mid range/top end pipe. Better than stock but not as good as a Paul Turner.