Big Gun Exhaust

[van0000x]

I just bought a new Big Gun Race slip-on, on e-bay. I'm installing it on a 400 EX. I haven't been able to find any info on the Race series. It seems like the EVO X has replaced it. Will I need to re-jet using this slip on? Any info or opinions are welcome thanks

[humblesquirel21]

u cna get away with not rejeting its not good for the system ull be runing lean but i had a full system and a filter on my 300 and no major problems with out jeting knowing what i knwo now i wish i hadn't but its not gona kill ur biek or anytihng esspecialy not with just a slip on. with a slip on i wouldn't i dont think