These Chrome BBK 351 Swap Headers will allow you to directly bolt on the factory or after market 5.0 H pipes to a 351 Windsor block. They will add up to 12 horsepower to your car. These headers come in a chrome finish, and feature 3/8" one piece thick die stamped precision fit flange, that is fully pressure tested to ensure a leak free fit every time. All tubing is fully computer mandrel bent for optimum gas flow and all Headers are made with factory OEM Dome style collectors for a leak free fit. They come complete with all new hardware and gaskets. Application:1979-1993 Ford Mustang with a 351w