2011-14 Mustang GT header system designed to maximize the horsepower on that 5 liter motor. Don't settle when it comes to your Mustang and get the best header system on the market. Our products have a reputation for unmatched quality and performance. Do yourself a solid and get a set ordered today so you can gap your buddies on the track. Features: M11HDRCATX Add horsepower and torque with this bolt-on upgrade 304 Stainless construction will last a lifetime Crossover x-pipe to promote increased airflow Smooth mandrel bends optimize exhaust flow Fully TIG welded for strength and beauty Multiple connection options to match your build Stock Exhaust (Factory Connect) Built To Order in 4 Weeks M11HDRCATX Emissions: This product is not legal for street use on an emissions-controlled vehicle. It may be used on dedicated competition or pre-pollution controlled vehicles only.