770HP Audi S1 Quattro Hillclimb by Prospeed AMAZING Sounds

In this video you can see/hear the awesome Audi S1 Sport Quattro in action during 46° Verzegnis Sella Chianzutan. The car has been modified by Prospeed to compete at the highest level of Hillclimbs, and it should be able to produce around 770 horsepower!

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