NSU Ro 80, 1971, by Pininfarina. Another 50 year old concept that remained in 1971. Volkswagen owned NSU by this time and had made it part of Audi, the rotary-engined Ro 80 would remain in production until 1977. But Audi's plans were for the Ro 80 to be replaced by second generation 100 and beyond a few rotary engined Audi prototypes, for the troublesome Wankel engine to be abandoned. Paulo Martin's elegant saloon, with it suicide doors and removable roof panel, is now housed in Audi's museum.