Reviewed By Marcus K (OXFORD, MI) Reviewed for a 2011 GMC Sierra —3/28/2017 3:41 AM
Everything I've been looking for.
Reviewed By aaron k (Kalamazoo, MI) Reviewed for a 2011 GMC Sierra —3/9/2017 3:50 PM
i entered the 93 octane tune into my 2011 GMC Sierra along with a K&N air intake system, and I felt an immediate change in performance. the truck responds to the throttle much better, and I'm getting 2.5 more miles to the gallon.
Reviewed By Pete S (Taylorville, IL) Reviewed for a 2011 GMC Sierra —10/4/2016 8:48 AM
I installed this on my 2011 GMC Sierra and have noticed a huge increase in throttle response, power, and fuel economy. I'm getting close to 60 miles more per tank than I was before disabling the AFM.