You can find the chip tuning file for your GMC Sierra 2014 - 2016 6.2 V8 420hp vehicle on our site. These files are created especially for you and handed to you. All our Tuning files are extensively tested on Dynometer. The development of the tuning file for your GMC Sierra 2014 - 2016 6.2 V8 420hp vehicle is the result of a special product by EcuPrime Engineers. In addition, we can increase the power of your vehicle from 420 HP to 440 HP, 609 Torque to 630 Torque.