You can find the chip tuning file for your GMC Sierra 2008 - 2013 6.2 V8 403hp 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 2008 - 2013 6.2 V8 403hp vehicle is the result of a special product by EcuPrime Engineers. In addition, we can increase the power of your vehicle from 403 HP to 425 HP, 565 Torque to 585 Torque.