You can find the chip tuning file for your GMC Sierra 2008 - 2013 5.3 V8 326hp 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 5.3 V8 326hp vehicle is the result of a special product by EcuPrime Engineers. In addition, we can increase the power of your vehicle from 326 HP to 345 HP, 472 Torque to 495 Torque.