[Joseph1LE]

I don't think a tune is a good idea with a lease. You can flash it back to stock but GM can still tell that the ECM has been flashed. I'm not sure if once you return the car then you're off the hook for that kind of stuff, but just something to look into before you have it tuned. Perhaps if you can find some cats that won't set a check engine light somehow, then maybe you could do that and keep stock tune. But regardless I'll let you know that the dual mode exhaust with headers sounds absolutely amazing.

But besides that, CAI and a ported throttle body are both must haves. The Vitesse throttle controllers have a pretty good reputation on here so thats something else you could look into.