Reviewed By David B (Lockport, NY) Reviewed for a 2009 Hummer H3 —3/30/2015 12:08 PM
Saw a 30 mile increase with the first tank of fuel...it will pay for itself in 6 months...better fuel economy with greater performance!!!
Reviewed By sky b (FAIRFIELD, CA) Reviewed for a 2015 GMC Sierra —8/21/2015 8:39 AM
Overall great but doesn't work with the 8 spd trans. 2015 1500 Denali 6.2L. the workaround is to choose manual transmission in programming, but obviously you aren't getting any shift point adjustments or anything. Another note is that I have a lift and 35" tires, but the speed calibration had to be set to 33 to be accurate. "Luckily," we have the radar signs in our neighborhood, so I could take a few tries and get it dialed in, otherwise speedo would have read fast, not slow.