Porsche decided to end its 20-year history of factory sports car racing and sold the 908/03 cars to customers. Besides developing the 917/10 turbo for the Can Am series, the Zuffenhausen-based company focused on the development of the already aging Porsche 911, testing the 911 flat-6 with turbochargers. Yet a 3 year old Porsche 908LH Coupé was entered by Reinhold Joest in the 1972 24 Hours of Le Mans, finishing a strong 3rd. Customers continued to race several 908/3, fitted with extra weight as required by the rules. In 1975, some 908s were fitted with turbocharged engines, similar to those used in the Porsche 934 GT car. Even with 2.1-litre and a turbo factor of 1.4, the turbos by now outpowered normally aspirated 3-litre engines. Taking advantage of that, in 1976 the factory developed the Porsche 936 to compete in the new Group 6 Two-Seater Racing Car category that replaced the Group 5 Sports Car class. Unlike the 934 and 935, Porsche did not offer the 936 for sale, entering it in a few races only, mostly at Le Mans. Several customer-908s were upgraded with 936-style bodywork. The "Porsche 908/80 Turbo" of Joest and Jacky Ickx which finished 2nd in the 1980 24 Hours of Le Mans turned out later to have a real Porsche 936 chassis, though.