Harald Ertl's custom Autogas BMW M1 broke 300 km/h, and now it's for sale

Its unique bodywork and twin-turbocharged engine were the result of a collaboration between driver Harald Ertl and British Petroleum in an effort to break the 300 km/h mark back in the early '80s. It was styled by Giorgio Giugiaro and ItalDesign, and its mid-mounted BMW Motorsport six-cylinder made a claimed 277 bhp. It was good enough for zero-to-60 passes in 5.5 seconds and a top speed of faster than 160 mph. At the time, it was the fastest street-legal German sports car available.