In sports car racing, production derived versions of sports cars also known as grand tourers , and purpose built sports prototype cars compete within their respective classes on closed circuits.The premier championship series of sports car racing is the FIA World Endurance Championship. The main series for GT car racing is the FIA GT1 World Championship. There is also the FIA GT3 European Championship as well as the less powerful GT4 European Cup. Previously, an intermediate FIA GT2 European Championship existed, but the FIA dropped it to cut costs. Other major GT championships include the Japanese Super GT championship and the International GT Open for GT2 and GT3 cars. There are also national GT championships using mainly GT3 and GT4 cars featuring professional and amateur drivers alike.