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Bulgarian tuner Prospeed has built a replica of Audi's fabled S1 World Rally Championship ... Helping in its bid for authenticity is genuine Group B horsepower: 800 ponies, to be exact.

Every gearhead should know about the Audi Sport Quattro S1. It was a Group B World Rally Championship legend back in the early '80s, along with other incredible competitors like the Ford RS200 ...