Borla Stainless Steel Cat-Back Exhaust System features patented, straight through and multi core technology to unleash hidden horsepower. It has 2.5 inch piping diameter, double oval rolled angle cut and exit rear. 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 austenitic stainless steel, superior to T-400 series knockoffs, to give you the absolute best in performance and durability. Ultra smooth mandrel bends ensure maximum flow and power, and precision computer-controlled CNC manufacturing ensures an accurate fit. Best of all, Borla stands behind every system with a Million-Mile Warranty