The Porsche GT2 comes from a long line of 911 Porsche Turbo racing cars in international motorsports. Starting with the 1974 911 Carrera turbo for Group 5 racing, followed by the 934 (a racing version of the 930) for Group 4 racing, then the famous Porsche 935 which dominated Group 5 and IMSA racing through 1984. In 1986 a Porsche 961 (racing version of the 959) would be created with little racing success but a leap forward in technology and development such as AWD, 4 valves per cylinder and water-cooled heads (which first appeared in the 1978 Porsche 935 Moby-Dick, used in the Porsche 956/962 GroupC prototypes and then in the 959/961). In 1993, Porsche had experimented with the extensively modified turbo 964, named the Turbo S LM-GT. Seeing the car's potential to be fast and reliable, as well as customer demand for a car to replace the 964 Carrera RSRs, Porsche chose to develop the turbocharged 993 for customer use.