When I got my Avy I was really disappointed with the "off the line" performance.? I spent $$$ on a Flowmaster American Thunder cat back, Pro Cold Intake and Hypertech programmer.? As far as I am concerned the off the line stayed pretty much the same.? At that time I had not done enough research to realize that our Arvy's have "Torque Management" programmed into them to protect the transmission and rear end.? Basically holds back timing = less power/ torque on that bottom end.? Don't get me wrong, these mods do make a pretty good difference when passing say 55-60mph to 90mph, for such a heavy hauler,? I think they also make a difference from say the far side of an intersection.? I really love the way the exhaust sounds and looks as well.
Having said all of that, if you look for a programmer look for one that you can adjust the torque management, or a custom tune.? Predator programmers can change the torque management.? If you look around the site you will see some other mods that others have found to be quite helpful as well. One I have been considering is a new Torque converter, many have used one from an I-6 (in line six) from the trailblazers.? In our heavier trucks they will stall much higher 2600-2800 or so.? Putting our trucks much better in the power curve off the line....
Or like many just save up or hit your CC and get Forced Induction....? I've been looking to do this for a while and am getting closer every day.
No matter what you decide enjoy, it becomes addictive, stay with this site and you will love your new ride and spend, spend, spend.................
Hope this helps,
Danv
P.S.? the Hypertech does do it's job for what it does, the shifts are firmer, did compensate for my new rim/tire size.? Many have been happy with it as well.? Just don't expect tons of power from an off the rack programmer on a gas rig, I think you will be disappointed....