This 2.75" diameter X-Pipe with Mid-Pipes is designed for use with Borla(r) Axle-Back systems ONLY. The system contains a Merge X-Pipe to unleash hidden horsepower and create a custom sound. The system includes AFM valves. Built from premium, high-quality T-304 austenitic stainless steel, superior to T-400 series (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(r) stands behind every Mid Pipe with a X-Pipe with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.