The Alpina E9 was introduced in 1970 as a variant of the BMW New Six. These 2-door rear-wheel drive cars, were highly specialized conversions based on models such as the 2800 CS, 3.0 CS, and 3.0 CSi. These versions included examples such as the Alpina A2, B2, and the more powerful B2S. All were equipped with inline six M30 engines with triple Weber carburetors or modified fuel injection systems. Transmissions were 4 or 5-speed manuals, with upgrades to the suspension, brakes and interior, as well as classic Alpina aesthetics. These were not series production models, but conversions carried out to order at Alpina's headquarters.