System will fit Bullitt models. NOT recommended for use on Convertibles. This 3" diameter high flow Cat-Back(tm) system was designed specifically for the Mustang GT and has Active Exhaust Valves. The system contains a Merge X-Pipe for increased performance and improved sound. The system has Borla(r)'s Polyphonic Exhaust Harmonizer Technology with 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 to the Borla(r) mufflers. The mufflers then enhance this sound to the character and volume of the aggressive ATAK(r) sound, with no drone inside the vehicle. The exhaust exits thru dual 4" round carbon fiber with black anodized center tips on each muffler. Systems with bright chrome on T-304 stainless steel tips, and black chrome on T-304 stainless steel 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.