Tuning that doesn't kill the host vehicle. Many tuners reduce fuel delivery as exhaust gas temps rise. But they ignore the powertrain! Banks finds the limits of the engine and powertrain, then adds mission-critical ActiveSafety and AutoRate safeguards to Six-Gun so it won't exceed those limits. Has 6 change-on-the-fly power levels. Is Stacked for Power to tune timing and fuel pressure. As a result, Six-Gun thrashes challengers, not your truck! Proof of a higher power. Calibrated for sport applications, Six-Gun is a performance junkie that adds +127 hp/+345 lb-ft. With its comprehensive CleanTune Technology and change-on-the-fly power, Six-Gun rockets you from 0-60 mph 28 percent quicker and in 31 percent less distance than stock ... without adding black smoke! Engine differences in 2004 vehicles: Early 2004 vehicles - LB7 engine (8th VIN digit - 1). Late 2004 vehicles - LLY engine (8th VIN digit - 2). Key Features: Gain up to +127 hp/+345lb-ft at rear wheels Destroys the competition, not your vehicle! ActiveSafety protects engine/powertrain 6 change-on-the-fly power levels 0-60 mph in 1/3 less distance! Loaded with Features Value Priced Easy Install 50 State Compliant CARB E.O. D-161-93