Reviewed By Craig B (Houston, TX) Reviewed for a 2008 Chevy Suburban —7/24/2008 8:23 PM
Big performance increase. It shifts really hard. I am not sure if I like this or not. Gas mileage increased about 5%. I was hoping for more.
Reviewed By Eric I (Spokane, WA) Reviewed for a 2006 Chevy Avalanche —7/13/2016 7:37 AM
After receiving the tuner, I updated through "ignition". Plugged in to my port, and could only get 12% download from stock settings. Called Superchips, got 5 more updates, had to unplug 2 radio fuses,and worked great. 3 to 4 mpg better on economy setting without losing power. Am going to try towing mode, and hope for good results as well. Good product, very good customer support!