Converts vehicles with factory single exhaust to dual exhaust. Fits underneath the factory bumper. This 3" diameter into dual 2.5" Cat-Backâ„¢ system features the classic S-type sound with no drone inside the vehicle and exits thru single 4" round black chrome on T-304 stainless steel tips. Using BORLAÂ Stainless Steel Polish p# 21461 is NOT recommended with these black chrome tips. We suggest cleaning the tips with hot water and a microfiber cloth. A system with bright chrome onT-304 stainless steel tips is also available. BORLAÂ Cat-Backâ„¢ and Axle-Back exhaust systems feature patented straight-through and multi-core technology designed to unleash hidden horsepower. Increased exhaust velocity adds power driving excitement fuel economy and the distinctive BORLAÂ Sound of Power respected by motoring enthusiasts everywhere. Each system is built from premium high-quality austenitic 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 fit. Best of all BORLAÂ 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.