well i got an 2004 WRX STI now, traded the 2004 350Z in for it. just b/c i like the blowing off sound of the car. my friend has one, but his is an 2002 WRX(NOT STi). well he told me that that car cant be tuned any better, is that TRUE? he said that b/c factory parts already crank as much HP out of it as possible already, so aftermarket upgrades doesnt effect anything.