According to this article, he may have been racing a SLR:
http://www.msnbc.msn.com/id/11488164
But wait, there's more twist to this story, not only he's probably the driver and is denying that because he was under the influence. According to another board, he is a race car driver of Cirtek Motorsport, he raced a Ferrari 360 in the 2005 Le Mans.