I could test the capabilities of the 2009 Audi A-4 through two different circuit exercises - one of which is this tight course. The camera didn't pick up any sound, which is half of the excitement - just play the movie Transporter in the background and you'll get the gist.

But in comparison to the 2008 BMW 328xi, the 2008 Lexus iS 250, and the 2008 Mercedes-Benz C300 - Hands Down - Audi A-4 whoops them all. (less info)