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   With the Bully Dog 40420 GT Platinum Diesel tuner get the true potential of your 2015 – 6.7L Cummins (unlock cable required), 6.6L Duramax and 6.7L Powerstroke. This part is in stock @ Marken Performance.

2015 Cummins 6.7L tunes:

• Stock: No Horsepower / Torque Gain
• Tow Gains: +26 HP / +8 lbs Torque
• Performance Gains: +55 HP / +96 ft-lbs Torque
• Extreme Gains: +97 HP / +185 ft-lbs Torque

2015 Duramax 6.6L LML tunes:

• Stock: No Horsepower / Torque Gain
• Tow Gains: +31 HP / +59 ft-lbs Torque
• Performance Gains: +50HP / +91 ft-lbs Torque

2015 Power Stroke 6.7L tunes:

• Stock: No Horsepower / Torque Gain
• Tow Gains: +20 HP / +50 ft-lbs Torque
• Performance Gains: +48 HP / +92 ft-lbs Torque
• Extreme Gains: +71 HP / +145 ft-lbs Torque 

    The Bully Dog GT Platinum Diesel 2015 applications offer all of the same benefits you have grown to love – switch-on-the-fly power adjustments, download functions, tune safety protection (defueling), monitoring via virtual gauges and more!