Reviewed By Jeff K (STOCKTON, CA) Reviewed for a 2012 GMC Sierra —7/23/2018 9:48 PM
I installed this in my 2012 GMC Sierra with 5.3. I am in California so I was happy this is CARB legal! Install was super simple. I mainly bought it to delete the factory AFM ( active fuel management) which it did, plus soooo much more. My truck runs way smoother on the 87 tune and there is a noticable power gain. Even more on the 91 tune. Firmed up my shifting set at 50%. This is a step above the AFM ONLY delete devices, for not much more cost. Plus you can uninstall tunes and reinstall tunes.