Mopar Performance - Single Split Rear Exit with Round Chrome Tips - Charger/ 300/ Magnum 2005-08 5.7L. Mopar Cat-Back Exhaust Systems feature patented straight-through and multi-core technology to unleash hidden horsepower. Increased exhaust velocity provides horsepower and torque gains driving excitement improved fuel economy and a deeper tone. Each system is built from premium T304 stainless steel superior to T-400 series knockoffs to give you the absolute best in performance and durability. Ultra-smooth mandrel bends ensure maximum flow and power and precision computer-controlled CNC manufacturing ensures an accurate fit.