Fat boy 4?

[Yfz450dan]

Is the fat boy 4 any good.I herd won on a yfz on atv sport tv on there project bike and it sounded sweet! Real deep!What do guys think?:confused:

[tater_kamik]

i dont know anybody who has ran the fat boy... i dont know why though:confused:

[99_300ex]

one of my buddys has one on his yfz and it sounds sweet and i think does real good i think why people dont run them often is becuase they are kidna on the expensive side.

[d kelley]

fat boy exhausts are one of the best exhaust systems there is for the yfz-450. they have a lifetime warranty and make awesome power. Duncan racing racing builds them and they come with a jet kit and instructions. the mounts are super strong but the only possible down side is they are loud! I'm talking 103-105 db's loud. If you race where there is sound restrictions you should get there spark arrest insert for $40 extra or something like that.

[Yamahauler_04]

They are also coming out with a quiet series. Call them and ask.