This Borla(r) Cat-Back(tm) system was designed specifically for the Mustang Dark Horse. 3" diameter True Dual system for high flow. System features a merge X-Pipe for increased performance and improved sound. System has Active Exhaust valves. System features Borla(r) 's Polyphonic Exhaust Harmonizer which utilizes patented units that contain pipes of different diameters and lengths to create multiple exhaust notes that harmonize to deliver a clean, rich, full-bodied sound. This system features the aggressive ATAK(r) sound with no drone inside the vehicle and 5" bright chrome on T-304 stainless steel tips. Systems with black chrome on T-304 stainless steel tips, and carbon fiber tips are also available. Borla(r) Cat-Back(tm) and Axle-Back multi-core technology is 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 & power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit 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.