Bully Dog GT Tuner



Fits Cummins/ Powerstroke/ Duramax


The GT Gas and Diesel tuners unlock more horsepower and torque to meet the unique demands you put on your vehicle. With preloaded tuning, customizable gauges to track performance, and a wide variety of hauling features, you’ll have plenty of power to take on tough jobs or improved fuel economy for long highway hauls.

Bully Dog tuning devices will not modify or delete vehicle emissions. Bully Dog products that are purchased comply with the Clean Air Act. Tunes that are preloaded in our devices have gone through hours of testing to ensure the safety of the drivers and the environment overall. Custom tuners are required to follow the guidelines of the Clean Air Act as they develop their own tunes for our devices.


  • 2003-2021 Dodge Cummins
  • 1999-2019 Ford Powerstroke
  • 2001-2016 Duramax


Additional information

Weight 2 lbs
Dimensions 12.5 × 9.5 × 4 in