1. Best bang per buck mods are the JLT series 3 CAI with SCT X4 tuner, Steeda underdrive pulleys, and DIY charge motion delete plates.
2. The tune will definitely remove that drive-by-wire throttle lag.
3. A stock 3v motor makes more power than a stock 2v PI motor across the whole rpm range.
4. The '05-'06 GT came with 3.55 axle gears as standard so your assumption is correct.
thank u for all the answers. my plan is to do cost effective mods that actually do make a difference. today I picked up a SCT sf3 for $200. pretty fair deal. Im currently looking for a CAI that compliment the tuner. . . anyone have one for sale? there's one on ebay I am watching.
if the SCT does eliminate the throttle lag or at least take a good bit of it out, i'll be happy.