Description Reviews BORLA MINI Cooper S Cat-Back exhaust 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 BORLA 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 numerical control (CNC) manufacturing ensures an accurate fit. This Borla catback system features 4" mirror polished T-304 stainless steel tips. Best of all, BORLA 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. Part Number: bor140517 Description: S-Type; Cat-Back System Inlet Size (in.): 2.25 Outlet Size (in.): 4 Exit Position: Dual Center Exhaust Type: Single Exit Style: Straight Muffler Type: Turbo System Type: Cat Back Title: Borla - MINI COOPER S-TYPE Tubing Diameter: 2.250 in. Construction: All Welded Material: T-304 Stainless Steel Tip / Outlet Finish: Polished T-304 Stainless Steel Installation Instructions