BORLA(r) Axle-Back exhaust system 11953BC is designed to fit the 5.0L Mustang GT that is NOT equipped with Active Valve Performance. It features dual black chrome on T-304 stainless steel tips and the "S-Type" sound. Using BORLA(r) Stainless Steel Polish p#21461 is NOT recommend with these black chrome tips. We suggest cleaning the tips with hot water and a microfiber cloth. It fits both the coupe and convertible models. The straight-through and patented multi-core technology is designed to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive BORLA(r) Sound of Power respected by motoring enthusiasts everywhere. Each system is 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(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.