EXCEPT Convertible. This X - Pipe is emission legal and includes AFM valves. These Mid - Pipes are NOT intended for use with OE factory mufflers. X - Pipes unleash hidden horsepower and create a custom sound. 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 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.