Man when you get those 4.56's try it on the track with the stock tires just to see what can that baby do

With the 10psi and alcohol injection tunning is gonna be needed for sure but, why wait?, there is a lot of hidden power on your truck, performance tunning is a most, believe me, you won't regret it, I got mine just to get the most out of my truck, not because of detonation problems and the truck felt totally different, it's alot faster, more responsive and the MPG went up; It's worth every penny. Besides, with nelson's you've got free upgrades for life so you can change it or adjust it for future mods.

Trust me, sell your Hypertech and get a tune, you won't believe the difference.

Check:

http://www.nelsonperformance.com/gmproducts.htm

"No Downtime; We'll ship you another PCM.

99-00 GM Trucks Performance Programming - $375
01-02 GM Trucks Performance Programming - $425
03-04 GM Trucks Performance Programming - $490"

and besides there is a group purchase right now, so you can save a little more $$$

check:
http://forum.ls1truck.com/index.php?showtopic=1464
http://www.gmfullsize.com/forum/showthread...64&page=1&pp=10