...it turning it into some ricer? If i cant do it within $500 or so, id rather not do it because i know if i go too cheap itll just mess it up and turn the nice car into crap

Best way is a short ram cold air intake and a cat back exhaust, but it will cost you a little more, and also is worth it because its a fine sports car as in luxury and sports if you just get these 2 items.

cold air intake & exhaust system is the best but your worried about messing up the car you will need more than a cheap $500.00 fix up.

& if you want quality performance go to the dealer / or check on line @ Nismo.com Nismo parts work the best and won't hurt the warranty.