Well, Ive got a Monte not a Grand Prix but ya know there the same. Ive always been a truck guy but when i got this car and saw all the mods you can do well I figured id stick with it. So far i have some Force Pro Mufflers (jegs version of a flowmaster sounds great) w/ Stainless tips, A gutted air box w/ K&N Filter, A ZZP PCM, And the PFYC Ram Air Hood. Heres some pics Lemme Know whatcha think.