This dual 2.75" diameter into the mufflers with dual 2.5" out of the mufflers Cat-Backâ„¢ system features the aggressive ATAKÂ sound. It has a Merge X-Pipe for increased performance and improved sound. BORLAÂ'S advanced muffler technology allows us to provide a no drone guarantee on this system. Tips NOT included this system utilizes the factory exhaust tip/ bezels. System features valves for the Selectable Driving Mode. BORLAÂ Cat-Backâ„¢ 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 BORLAÂ Sound of Power respected by motoring enthusiasts everywhere. Each system is built from premium 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 numerical control (CNC) manufacturing ensures an accurate fit. Best of all BORLAÂ 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.