Optimum fuel tuning for awesome power, built-in safety and adjust-on-the-fly power. Calibrated for sport, Six-Gun is a fully engineered diesel tuner with an unmatched combination of power, safety and versatility. It delivers pavement-shredding best gains of +105 hp and +258 lb-ft at the rear wheels;has 6 change-on-the-fly power levels;is Stacked for Power to timing and fuel pressure;and has exclusive AutoRate and ActiveSafety engine and transmission safeguards.