Bully Dog GT Diesel 40420

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. 

WHAT YOU CAN ADJUST

Note: Adjustable Options vary for each vehicle and are not available on all vehicles

• SPEED LIMITER - Change the top speed that the vehicle will reach before the engine automatically limits the power needed to go faster.

• TIRE SIZE - Correct the speedometer if you have changed your tire size from stock.

• COOLANT TEMPERATURE - Current coolant temperature; this information is used for warning level and safety defueling settings.

• TRANSMISSION TEMPERATURE - This gauge option shows the transmission temperature. This information is used in defuel settings to help prevent heat damage to the transmission. (This gauge option is not available on all vehicles.)

• BOOST - This gauge option shows the boost. This information is used in defuel settings to reduce the boost when the limit is exceeded.

• PYROMETER - This gauge option shows the pyrometer temperature. This information is used in defuel settings to reduce the exhaust temperature when the limit is exceeded.