I guess I just worded my question wrong(poorly). Would it be worth it to go 2.5" piping just to get x amount of HP more or should I just say "F--- it, I've got 7 year old car, with an ATX and a tiny little V6" and not worry about squeezing every last HP out of something that is never going to be fast enough for me or anything else on the road. That is what I wanted to know. Instead, I got brutally told by Demon, I feel like such an idiot.