This dual 2.75" diameter into the mufflers with dual 2.5" out of the mufflers Cat-Back™ system features the aggressive ATAK® sound. It has a Merge X-Pipe for increased performance and improved sound. BORLA®'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. 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 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, 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.