Just bought an 07 Grand Prix GT and am looking to do some mods too it. I am about to order the basics (cai exhaust and high flow cat, coil packs with msd wires and plugs) but am kind of stuck in a dead end after that. Short of computer tuning I'm at a loss for more upgrades and research on the internet has been hit and miss on certain things. If anyone has any suggestions I'd appreciate it. Also any idea in what I can expect in terms of power gains from the above mentioned upgrades? Thanks to all.