Thank you for a very detailed response. I just got my cobra and I have CAI, and could only afford to do half my exaust from the stock cats back. I plan on completing my exaust, with O/r X pipe into BBK long tube headers, also upgraded TB. I would also love to save up my moey and get a Kenne bell supercharger down the road... also maybe stage III cams, with some ported heads. I have the original packaging from my diablo chip, all it says is DiabloSport chip? I will open my passenger side kick panel to confirm. So let me get this straight, if I do any aftermarket purchases, I then have to take it to a speed shop and get my chip adjusted? Thats seems more of a pain in the butt, than to have a hand held tuner. P.S. how much does it cost to take a car in and have a tune at a speed shop?