Stuttgart. Porsche has added a new sports car for recreational and club racing to its fleet: The Cayman GT4 Clubsport celebrated its world premiere today at the Los Angeles Auto Show. The 283 kW (385 hp) mid-engine racer for motorsport newcomers, which is not road homologated, is based on the successful street-legal Cayman GT4 sports car. Sales of the racing car start with the unveiling at the trade show.