Headers > PLOG, 180* TStat and Cooler Plugs are a must...
Junk the HAI, get or make a CAI/FWI
Rockers are a good idea, but if you plan to CAM 1 day, don't waste $$$ on Rockers you'll be removing.
You NEED a Scan Tool that LOGS DATA
Get a PowrTuner on the cheap from the FS Sections of a GP Forum.
If or B4 you can get a tuner, find someone with a tuner to modify your bin in reguards to the cooling system (This will help some, and is needed after changing the TStat)
Remove SC Cover, Hood Liner, and rear weatherstrip under the hood (Gets air moving)
I'll get sh|t for this, but I've proven it with scans...
TB Spacer to keep hot coolant from flowing threw the TB, also a TB Heat Shield
Maintenance!!! Don't forget the SC Oil!