New 25% underdrive balancer for 2005-2009 5.7L/6.1L (Note: Does not fit 09 5.7L) Dodge Charger/Magnum/300C incorporates a number of high quality features you won't find on any other aftermarket unit and makes up to 9 additional rear wheel horsepower and 10 ft-lbs of rear wheel torque over the stock crankshaft pulley. Pulley features are a pair of extra tall belt retention walls that eliminate the belt slippage issues common with other balancers. Other unique design strengths include a 100% steel construction (other brands use aluminum), integral timing marks and built in puller mounting threads. Includes detailed installation instructions. Features: Up to 9 Rear Wheel Horsepower Increase Up to 10 ft-lbs. Rear Wheel Torque Increase Extra-tall belt-retention "walls"-no more thrown belts! 100% steel construction Lighter than the stock balancer Integral timing marks and puller-mounting threads Does not cause false knock retard or erratic power-curve dips

Note: Requires new belt - 6PK2025 or similar.