aFe Axle Back Exhaust (Polished / Black & CF Tips), 2015-2018 BMW M3 M4 F80 F82

Features: +17 HP and +25 lbs. x ft. Torque max gains Constructed from 100% hand TIG-welded, 2-1/2" to 3" mandrel bent, brushed finished 304 stainless steel tubing Includes a factory style exhaust valve Utilizes a unique high flow, transverse muffler with a high-temp powder-coated metallic black finish Includes Quad, 3-1/2" diameter double wall, stainless steel polished tips Uses all factory hanger locations for a hassle-free installation Aggressive Sound:A free-flowing, transverse muffler is used to absorb high pitch tones producing a powerful sound and unleashing all available horsepower and torque. The muffler is finished with a high-temp powder-coated metallic black finish and a stamped aFe power logo. Exhaust Valve:This axle-back exhaust system incorporates a factory style exhaust valve which uses the factory exhaust valve motor (not included). The valve helps regulate, direct and control the flow of exhaust gases by opening, closing, or partially obstructing passageways dependin