300 HP without F/I isn't really possible. You could obtain a Euro Conversion from bmpdesign.com or whatever it is for about 2600 bucks and that adds tons of HP without forced induction. From that you can build on and get real close to 300HP. Or just add a turbo of some sort but like others have said, not worth it for a DD unless you're like me :P I have done TONS of mods to my car and I don't think I'm cranking out 300HP yet. If I were to guess, I'm somewhere in the neighborhood of 270crank hp, but that's just a guess. Good luck man.