From BMW Tech

The E25 BMW Turbo prototype was built as a celebration for the 1972 Summer Olympics in Munich.

For this occasion, renowned designer Paul Bracq created an innovative design for a BMW automobile, the BMW Turbo. Only two were ever built. Today, it is one of the rarest BMWs, with its elegant design, Gull-wing door and futuristic cockpit. BMW later used the Turbo's design themes on the M1, the 8-Series, the Z1 and the 2008 M1 Homage Concept.