Universal X - Pipe for building custom exhaust systems. X - Pipes increase performance and improved sound. 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 , Best of all, BORLA(r) 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.