Reviewed By douglas e (DOVER, PA) Reviewed for a 2009 Chevy Cobalt —12/21/2012 6:52 AM
Unbelievable power boost with no loss in mpg made the car so much smoother then stock made me love my cobalt ss so much more
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.