Gotta say, if you have some time to spare cause you're bored, then give this video a try. Demonstrates the great v8 rs4, a true piece of engineering refinement. I'm not exactly sure how old the video is, so if its a repost then I apologize. It's a top gear review.
PS. If this sparks a BMW vs. AUDI badge war..well...so be it.
http://video.google.com/videoplay?docid=7012996039848919542&pr=goog-sl