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If you want some basic and (for the most part) relatively inexpensive mod ideas - check out my thread:
http://www.camaro5.com/forums/showthread.php?t=302811
If you are looking for the most bang for your buck in mods - go with the Cold Air Inductions Cold Air Intake - Best $400 I spent on the car. Stripes are always nice to do as well to set your car off from the rest inexpensively (I recommend big worm graphix)