Borla Cat-back exhaust systems feature patented straight-through and multi-core technology to unleash hidden horsepower. The streamlined oval shape of the Touring mufflers allows more capacity within the muffler which results in a ride that is quieter than other Borla models. A single core, high-flow design adds power and driving excitement with the distinctive BORLA® "Sound of Power" that is deep and throaty but just slightly louder than stock at open throttle. Each system is built from premium 300-series austenitic 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 as well as 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. Mufflers have a 3" inlet and dual 2.25" outlets, systems are side exit.