Those Audis are FAST. And quiet - I'm sitting barely 70 feet away, and I cannot hear the car as it passes by at full speed.
They also spew some rather fragrant fumes from the diesel powerplant.
The Audi R10 is Silent but Deadly.
More to come...
EDIT: During a caution-flag pit stop to change the front end of the Audi, a cat -- yes, a cat, as in meow meow, walked across pit lane. SPEED channel didn't show this, because NASCAR Busch series qualifying is more important to them. SPEED TV sucks.