I'd start with an exhaust, downpipe and buy the HP Tuners software. Then find a good dyno shop that has experience with GM vehicles.
By owning HPT, you can have the PCM set up to each and every mod you add. Nothing better than having the car tuned specifically for YOUR car. You can also have it set up for an aggressive tune for days you want to drive hard or head to the track and a more conservative tune for other days. Only takes 20 seconds to switch between the two.
Anybody already have the Debbie Gibson on MP3??? LOL :P
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Black 2008 Sky RL, red interior.
cold air intake, cat back exhaust
GMPP stage 2, upgraded suspension
spoiler/mudguards/tonneau cover
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