How do they know who's won and who's lost a race? I don't get that..

Anyway, those cars :S Still wondering how those Japanese people get all that money. But I guess it's like they say in the theme song of Tokio Drift by the Teriyaki Boyz:
"You see him come and go out of the black Benz SLR.
I wonder where he get that kind of money?
Don't worry about it.
Lets Go"