I'm just looking for like a 20hp gain in my mp3, I have a cold air intake and a apex exhaust. I was thinking about nitrous, does anyone know if it will be ok to run on a stock motor its my dd in the warmer days so I don't want to kill my car, or if anyone else know any other good tips on boosting hp, but I'm really green when it comes to doing things myself I have a bunch of friends that help me.does anyone have a est. of hp, with a exhaust, and cold air?Cause for right now I'm just looking to get around 200hp, till I can afford a turbo.