Prosche wanted to compete with the Porsche 930 in the 1976 racing season and secured homologation from the FIA, the governing body for many auto racing events.
While the original purpose of the 911 Turbo was to gain homologation for the 1976 racing season, it quickly became popular among car enthusiasts. Four-hundred cars were produced by the end of 1975. Since Porsche wanted to compete in the 1976 season, they gained FIA homologation for the Porsche Turbo for Group 4 in Nr. 645 on 6 Dec 1975 and the 1,000th 911 Turbo was completed on 5 May 1976. 
