sorry for the newbie question but........(of course i could ask a person at a mod store but i would then feel they are just tring to sell me something)


what is the current size of piping does the wrx and sti 04 have now, stock?

does doing a 3 inch turbo back really do much for power?

how much of a gain is there on the new sti 04? (whp numbers?)
how about the 04 wrx?

should i go with cat or no cat?

benfits for doing this?

what is the gain or loss with the cat or no cat version of a 3inch turbo back?

is there alot of cops pulling people over for directly having no cats? or is that an extra cause the cop pulled you over for something else?

is there a heavy no cat smell alll the time or when parked?


there is just so many people with so many good opinions but is there real evidence here. i am a poor student who is addicted to mods that work so please help me before i make a mistake on doing something that is just hype. of course this addiction is way better then drugs. :banana: