I have a 2014 GMC Sierra SLT with 37 inch tires. I basically got this for the speedometer recalibration feature, which the tuning shop charged $250 for, so I got this for another $20. Calibration took 5 minutes and worked great. Even seemed to remove the shift points. So I said fuck it and uploaded an 87 octane tune with the AFM off. The truck feels more responsive and faster overall. Makes coming up a lot easier on the Autobahn as the truck is just slow at 37s.
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