Bought 2 of these after the 5.3L in my '08 Tahoe dropped 2 cylinders at 147K miles. Stuck them in my Tahoe (after a new engine) and '14 Silverado to make sure I don't have problems in the future. Maybe slight decrease in fuel economy, but doesn't appear to be much. Provides some peace of mind which makes it worth it for me.
Does what It says
Was looking to firm up my transmission shift points and disable the Active fuel Management system, This unit allows that to happen. I wish the instructions were a bit more specific as to what every setting can and will do, but I guess I'll figure it all out eventually. The performance tune is a noticeable difference from your stock tune but again I wish I had more details about the tune itself.
Very glad I got it!
Hardest part of installation is running wires and stuff. Bought this tuner after reading reviews on others.Bully Tech support is very helpful! Installed performance tune and drove to work for a week. MPG went from 17 to 20! Installed tow tune and pulled my 5800 lb travel trailer with full water tank.Tow MPG went from 9 to 13 and went faster up the hills with less downshifting! The driving coach takes a few drives to get used to but not a biggie!