We know the Audi RS5 is close to its debut. It's already been caught a few times without any disguise. Judging by the license plate, this video is likely of the same unmasked car we saw back in October. That doesn't matter too much because even if the sight is not new, the sound is. There is something very sweet about hearing the 450 hp 4.2-liter twin-turbo V8 being let out of its cage.

Hopefully the next place we see the RS5 will be at the Geneva Motor Show, but Audi still has breathing room before the car's debut. The production version isn't set to hit the street until the summer of 2010.

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