Reviewed By Antone M (middletown, RI) Reviewed for a 2011 GMC Sierra —5/25/2017 4:27 PM
Good system, downfall clamps don't seal and no converter clamp . For that money through the clamp in !!
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.