7. Mercedes C111
Although never a production model, Mercedes C111 was one of the most famous German supercars introduced in the early `70s. This orange classic was designed as a rolling test laboratory for different engine technologies and aerodynamic research.
Fitted with Gullwing doors, C111 concepts were equipped with various prototype engines including Wankel rotary units as well as few high-performance types of diesel. There was even a V8-powered version, as well.