I bought a new '07 GT in last June. Right away, I added a few things- Boss Custom 20" rims w/ lo-pros on them. SLP Loudmouth axle back exhaust/a Max Energy Programmer by Hypertech/and a matching Grabber Orange Cold Air Intake by JLT Performance. It was decent before, with the add-ons, it is a bit better. I plan to put some pulleys on it in the spring. What else can I put on it besides an off road pipe, or throttle body for performance?