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35Watch this Audi S1 Group B racer tear up the Kyustendil Hillclimb

Bulgarian tuner Prospeed has built a replica of Audi's fabled S1 World Rally Championship mauler out of a garden-variety Audi Coupe, and it's a convincing-looking beast. Helping in its bid for authenticity is genuine Group B horsepower: 800 ponies, to be exact. It won the Bulgarian Hillclimb Championship last year, and it recently ran up an incline at the Kyustendil Hillclimb, part of this year's championship series.

19Video: Promolicious clips of the Audi RS5 meeting its Ur Quattro brother

2011 Audi RS5 promo footage – Click above to watch video after the jump

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