This is a performance tuning package for your 2014+ Sierra 5.3 ECOTEC3 Truck.
Improved throttle response
Faster and firmer shifting
Improved fuel efficiency
+15HP +34TQ with premium fuel
*You will need a Windows computer to download the tuning software and to send/recieve files to load to the handheld. Software is NOT compatible with Apple operating systems or tablets running Windows RT.