Originally posted by ClassA
Point taken, but he won't get that with 500 bucks. CAI would run about 140-180, Headers about 250-350, and a custom exhaust... hell if I know. Custom exhaust is the only way he'd go. He's not one for the loud weed whacker sound 
You can pull off what i suggested for under 500, you just have to find a used CAI and header. Oh, and do you know what the difference between custom and mass produced exhausts are?