EXCEPT John Cooper Works. This 2.5" diameter Borla(r) Axle-Back system delivers our classic S-Type sound with no drone inside the vehicle. It features 4" round high temperature black coated T-304 stainless steel tips. A system with polished T-304 stainless steel tips is also available. Borla(r) Cat-Back(tm) 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 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 o power and precision computer numerical control (CNC) manufacturing ensures an accurate fit. Give your Cooper S the sound and power it deserves bolt on a Borla(r). 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.