This is one of only five examples of the BMW 320i Turbo IMSA ever built, and this car is the only lightweight example, with a kerb weight almost 300 lbs lower than its four siblings.

Although BMW didn’t admit it at the time, the program to build the 320i Turbo with a heavily reworked M12 engine was really a skunkworks vehicle intended as a development car to experiment with a new turbocharged engine for future Formula 1 use.

The future Formula 1 engine would be named the M12/13, this turbocharged power unit was capable of 1350 bhp in full qualifying trim, it would be fitted to Brabham, Arrows, and Benetton cars, and it would win the Formula 1 World Championship in 1983 with Brabham.

The program to build an E21-based IMSA GT racer started in 1976, it was intended to follow in the footsteps of the successful CSL racing program,

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