Reviewed By Brad T (SUNOL, CA) Reviewed for a 2006 Hummer H2 —10/29/2013 6:38 PM
Easy installation, love the auto tranny shift firmness adjustability and yes actually I can notice a performance increase
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.