aFe's Mach Force XP cat-back exhaust system provides true muscle car sound and power for the Dodge Challenger. This system produces 11 Hp and 15 lbs. X ft. of torque at 3747 RPM. The Mach Force XP cat-back exhaust system is constructed from 3" mandrel bent 409 stainless steel and utilizes OE style hangers and band clamps for a clean installation. This system is finished with two dual 2.3" polished SS tips.