Borla 140600 - S-Type Cat-Back Exhaust System For 2015-2018 BMW F80 M3 Sedan/ 2015-2020 F82 M4 Coupe 3.0L 6 Cyl.. Automatic/ Manual Transmission Rear Wheel Drive 2 and 4 Door.

System features a merge X-Pipe for increased performance and improved sound. Borla system has valves. System features polished T-304 stainless steel tips. Borla Cat-Back and Axle-Back exhaust systems feature patented straight-through and multi-core technology designed to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive Borla Sound of Power respected by motoring enthusiasts everywhere. Each system is built from premium austenitic T-304 stainless steel, superior to T-400 series knockoffs (such as 409), to give you the absolute best in performance and durability. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer-controlled CNC manufacturing ensures an accurate fit. Best of all, Borla stands behind every system with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.