Reviewed By Creighton C (Concord, GA) Reviewed for a 2015 GMC Sierra —5/31/2017 9:50 AM
Really woke up the 5.3L in my vehicle using the canned tune. I have the Borla catback system as well so turning off the AFM is a plus, and the transmission shift to firm helps as well. Documentation could be better to help explain parameters for vehicles, etc. But overall I'm pleased and would recommend it.