vf34 turbo, fmic, sti injectors, walbro fuel pump, aftermarket upipe, utec, greddy evo2 catback . . . .
would there be a big difference in hp/torque if i have a stock downpipe with the above setup as opposed to an aftermarket downpipe . . . . the reason i am asking is because the emmission regulations are strict here in PA and i don't want to have to deal with swapping out exhaust parts every year so i was planning on leaving the stock downpipe as is and just replacing the uppipe (so that i can up the boost) . . . .