All BBK 2005-2008 Mustang throttle bodies are designed to increase airflow and improve horsepower from between 7-12 HP depending on vehicle and application. BBK is the world's number one manufacturer of aftermarket performance throttle bodies for late model EFI performance cars and trucks. All BBK Performance Power+Plus Series throttle bodies are CNC machined from high quality 356 aluminum castings to ensure perfect OEM quality and fit every time. Features like OEM die stamped throttle linkages, double sealed bearings, o ringed throttle shafts and new electronic controlled injection molded plastic gear assemblies for the new modern drive by wire applications, make BBK throttle bodies number one in performance and quality. All throttle bodies are direct replacements and include new gaskets and detailed installation instructions. Application:2005-2008 Ford Mustang 4.0L