Ryan, my car is yet ( and will continue to be ) a sticker virgin. I just put a set of side marker lights in today, and the sail panels are blacked out. Other than that ( and my stereo ) the car is completely stock.
CYS, the subwoofer you choose will drive the sized box you need- even within subwoffer sizes the air volume requirements vary widely. I'm almost regretting installing a system, though. I spent the cash on the system before I found this website- I think if I would have seen this site first, I'd be the proud owner of a borla exhaust and a new Y-pipe instead!