Optimum fuel tuning for awesome power (+115 hp, +206 lb-ft), 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 +115 hp and +206 lb-ft at the rear wheels;has six change-on-the-fly power levels;is Stacked for Power to tune pulse width, timing and fuel pressure;and has exclusive AutoRate and ActiveSafety engine and transmission safeguards. Test vehicle: 2003 Ford Extended Cab 2WD F350 Dually. Engine: 6.0L Power Stroke. Transmission: TorqueShift SR100 5-Speed Automatic. Note: Six-Gun tests performed with Banks Six-Gun Bundle airflow improvements. Upgradeable options include Banks iQ & airflow components to build a complete engineered power system. For best Six-Gun Tuner performance, Banks always recommends airflow improvements.