Borla S-type cat-back exhaust systems for the 1999 through 2004 Mustang SVT Cobra feature patented straight-through and multi-core technology to unleash hidden horsepower and produce a more aggressive sound and higher flow. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive Borla Sound of Power respected by motoring enthusiasts everywhere. Each 1999-2004 Mustang exhaust system is built from premium 300-Series austenitic 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 and power, and precision computer-controlled CNC manufacturing ensures an accurate fit. Best of all, Borla stands behind every Mustang exhaust system with a Million-Mile Warranty. It's just what you'd expect from the world's most experienced (and most winning) exhaust brand.