I ran around with a CAI and no tune for a long time. The Needswings CAI felt like it gave me 1000 more RPMs when flooring it. The butt dyno said I gained some power, and the sound put a smile on my face.

I have seen the threads about pulleys causing problems, but haven't had any problems with my Code 3 Performance supercharger pulley. I put all my mods on, and don't intend on ever taking it to the track. I drive for the exhilaration, not the ET. There really aren't any mods so crazy it won't make your car "streetable".