Ladies and Gentlemen drivers, you are looking at what is allegedly the fastest Audi S4 in the world. Forget the 333 hp developed by the supercharged 3-liter V6 of the current generation, this machine comes with over 800 wheel horsepower. The clip, which comes from ThatRacingChannel, shows us an USP Motorsports-owned B5 generation Audi S5 which has dropped its 2.7-liter twin-turbo engine for a VW VR6 24v unit, one of the favorite toys of ... [...]Source: autoevolution