The is the most successful purpose-built road racing car in the United States, with over 1,000 units manufactured by SCCA Enterprises . It is a single-seat, open-cockpit sports racer designed for paved road courses , known for its "momentum car" driving style that rewards smooth inputs and high cornering speeds over raw horsepower. Evolution of the Class
: Fully adjustable lower A-arms and upper rockers with sealed, rebound-adjustable Penske or Koni shocks. Ford Spec Racer
: Steel tube frame with a three-piece fiberglass body. The is the most successful purpose-built road racing