Not recommended for use on convertibles. This resonator is designed to dampen the sound of our Cat-Back systems 14742 and 14743. Use ONLY with BORLA systems. It is Not designed to work with competitors or Original Equipment systems. 3" diameter part. 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-controlled CNC manufacturing ensures an accurate fit. Best of all, BORLA stands behind every connection pipe with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.