Reviewed By anthony l (MARTINEZ, CA) Reviewed for a 2007 Hummer H2 —2/2/2017 11:27 AM
I like how much faster the F5 is compared to the F4 . It has better graphics than the F4 and is just a good product overall and it made my truck a lot better to drive with more power and better shifts. I have a cold air intake , cat back exhaust which makes this tuner work even better.
Reviewed By Shawn J (CLOVIS, CA) Reviewed for a 2008 Hummer H3 —8/13/2014 11:57 PM
I wanted something that I could program myself instead of sending of my PMC to someone eles to program. I was able to change my tire size to compensate for the 33in tire I installed, also was able to change my shift point and shift firmness as well. It also came with two performance setting, an 87 and a 91 octane. I used the 87 octane in my 3.7 liter and I got a boost in performance and mileage as well. Which made me very happy.
