It was produced between 1968 and 1975 as Grand tourer- coupe. It was based on 2000C and CS but enlarged to fit the six-cylinder engine BMW M30, which is the engine produced for the most prolonged period from BMW. It was used successfully in racing competitions. E24 6 Series replaced it. The first model introduced was 2800CS in 1968. The front was made similar to the E3 sedan version. It had drum brakes and 2788cc engine with 168 hp. The performance was enhanced because of the lighter weight. 3.0 CS replaced it in 1971, which had a displacement of 2986cc, twin carburetors and 180hp. CSI was also introduced in the same year with 200hp and Bosch-D-Jetronic electronic fuel injection. They were offered with either 4-speed manual or 3-speed automatic transmission. In 1972 was introduced CSL for racing competitions, with 3003cc displacement initially and updated to 3153cc and 203hp in 1973. Spoilers, rear wing, and air dam were added. They won the European Touring Car Championship between 1975 and 1979. In 1974 was introduced the last version- 2.5CS, as an economical version for the oil crisis at the time, with 2494cc and 150hp. About 900 were produced. The production ended in 1975. Approximately 31 000 E9 were created in total.
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