The exhaust manifolds found on the 2005-2010 Chrysler 300C, Dodge Magnum and Charger Hemi engines were designed to combine the exhaust gasses from each of the cylinders quickly with a manifold that was cost effective to produce. Our 4-1 Shorty Style off-road racing headers are designed to allow the exhaust gasses to flow more freely from each cylinder and combine in a more efficient manner. Tubing has been optimized for the 5. 7L engine. This creates a reduction in cylinder backpressure and improved exhaust gas velocity. These improvements free up lost horsepower and torque. An added benefit is a more performance oriented exhaust sound. Replace for Dodge Charger 5. 7L HEMI (2006-10) Dodge Magnum 5. 7L HEMI (2005-08) Chrysler 300 C 5. 7L HEMI (2005-10)