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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 ...

Audi kept things commendably simple with the A1 and S1's cabin. The infotainment system does now feel a generation out of date, though, with clunky graphics and a slightly dim-witted sat-nav.