Borla Cat-Back exhausts features patented, straight-through and multi-core technology to unleash hidden horsepower. It's 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 the absolute performance and durability. Ultra-smooth mandrel bends ensure maximum flow and power. The precision computer-controlled CNC manufacturing ensures an accurate fit. Borla stands behind every system with a Million-Mile warranty.