This 2.5-inch BORLA Axle-Back system offers our signature S-Type sound without cabin drone. It showcases 4" round, mirror-polished T-304 stainless steel tips, with a black-coated option also available. BORLA's Cat-Back and Axle-Back systems boast patented straight-through and multi-core tech, unlocking hidden horsepower. Enhanced exhaust velocity boosts power, driving thrill, fuel efficiency, and the iconic BORLA Sound of Power. Crafted from premium T-304 stainless steel, these systems outperform T-400 series alternatives. Ultra-smooth mandrel bends ensure peak flow and power, while CNC manufacturing guarantees a precise fit. Upgrade your Cooper S with BORLA and enjoy a Million-Mile Warranty. Fits: 2015-2024 Mini Cooper S.