You can find the chip tuning file for your GMC Sierra 1999 - 2007 6.6 Duramax 365hp 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 6.6 Duramax 365hp vehicle is the result of a special product by EcuPrime Engineers. In addition, we can increase the power of your vehicle from 365 HP to 395 HP, 894 Torque to 945 Torque.