EXCEPT Convertible. These Mid - Pipes are NOT intended for use with O.E. factory mufflers. This system contains an X - Pipe and is emissions legal. X - Pipes unleash hidden horsepower and create a custom sound. The design ELIMINATES the AFM valves from the system. It is intended for manual transmission equipped vehicles that did not come with AFM valves, but can also be used to delete AFM valves on automatic vehicles. Deleting the AFM valves will cause a check engine light to be activated. Built from premium T - 304 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 Million - Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.