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Encounter - The Audi Technology Magazine 1/2013
Auto Union type D twin supercharger - The beauty of technology is evident in the inimitable form of the Auto Union Grand Prix race car. In the late 1930s, it united an innovative concept with the highest level of perfection; today, it is a milestone in automotive history. 485 horse power were generated by the twin-supercharged twelve-cylinder – for the substantial drum brakes, an often virtually insurmountable challenge.