tell us your setup....turbo, wastegate, manifold, engine management...

if you're gonna run 4psi max... get a sc. i dont know if a wastegate will allow a max boost of 4psi LOL....

if you want the cheap way.. fuel pump, 310 injectors or dsm450 and atleast 8-10psi.

a few years back we made 570whp on a completely stock gsr motor and other have made over 600. its all in the tuning....