You can find the chip tuning file for your GMC Sierra 1999 - 2007 8,1 V8 330hp 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 1999 - 2007 8,1 V8 330hp vehicle is the result of a special product by Hyperols Engineers. In addition, we can increase the power of your vehicle from 330 HP to 350 HP, 610 Torque to 630 Torque.