As stated above, hps/cobb intake hoses, K&N drop-in filters, cat-back exhaust, hi flow cat/test pipe +/- an ecu tune to raise rev limiter and get a few more hp out of the breathing mods is IMO the way to go. The ecu tune certainly isn't needed, but it's nice to have to maximize the mods. Now if you chose to add Long tube headers to that list (this isn't so popular due to cost of both the headers themselves and the installation cost, but if you're an N/A purist, I say headers are a must have - though they are in no way a bang for your buck mod) an ecu tune would be needed as they cause the car to run rich and lose power and torque.
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K&N // GTM // BERK
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