This cat-back exhaust system is constructed of 3 IN - 2-1/2 IN mandrel-bent 304 stainless steel tubing for maximum strength and durability. This system features a high-flow stainless steel high-temperature metallic black muffler, producing a aggressive sound. The muffler has a high-temperature metallic black finish for ultimate corrosion resistance. Finishing off this exhaust system are quad 4 IN diameter black 304 stainless steel exhaust tips. The tips features a laser etched aFe POWER logo for a unique style. This system produces an aggressive sound unleashing all available horsepower and torque. Utilizing a factory style flange and hangers this system is a direct bolt-on system, which requires no cutting or modifications for a hassle-free installation. This system incorporates a factory style exhaust valve which use 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 depending on throttle position for maximum performance. A mitered merge collector is used to decrease turbulence and increase exhaust velocity resulting in increased horsepower, torque and improved throttle response. 100% TIG-Welded for race-proven strength and durability. MACH Force-Xp 3 to 2-1/2 IN 304 Stainless Steel Cat-Back Exhaust w/ Black Tip BMW M2 (F87) 16-18 L6-3.0L (t) N55 BMW M2 (F87) 16-18 L6-3.0L (t) N55 Fitment: 2016 BMW M2 Base 2017 BMW M2 Base 2018 BMW M2 Base