Not sure which 2011 GMC Sierra Performance Chips & Programmers are right for you? We have over 3535 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"I bought this for my 2002 Chevrolet 2500 HD 4x4 6.0 liter gas pickup because I needed a little more power to pull my RV. It is a fifth wheel that weighs about 10,000 lbs. About two weeks later, I installed a KN FIPK cold air intake. I didn't pull the trailer with only the programmer - I had already installed the intake when we went on a trip after installing the programmer.As far as performance, the Hypertech really helped to firm up shifts dramatically. The truck shifts quickly and firmly. No more slipping between gears gear. In terms of power, I can tell a difference in power, but it is not dramatic. It is really difficult to tell the difference between improved throttle response and a earlier locked torque converter and true horsepower without a before and after dyno run. The throttle response is much better, though, and the truck is a lot more fun to drive. Not a sports car, but definitely a difference that my wife could readily notice when she drove it.I chose the "regular unleaded" tuning. The programmer is worth the money in that premium gas was required when pulling the fifth wheel due to pre-detonation. With the programmer installed, I can pull the trailer with no problem using regular unleaded gas. With the difference between regular and premium usually averaging $0.20 per gallon and my truck getting 8 mpg while pulling (yes, it's awful...), the tuner will pay for itself in about 15,000 miles of pulling the trailer.Hard to comment on any gas mileage improvement. The truck drives and sounds nice, and I tend to put the foot in it more now. Normal driving, my mileage is about the same (12.5 mpg). Pulling seems the same also at 8 mpg." —Richard W from Prosper, TX bought a Hypertech Max Energy Programmer for a 2011 GMC Sierra.