To get some door seals like these. Thats the 2002 A4. That should help reduce B-pillar rattles and wind noise a good deal.

<img src="http://pictureposter.audiworld.com/14332/dscf0050.jpg">

Someone on A4 forum had pics of a 2002 A4 being tested on a drag strip of some kind. You should be able to find the post which was posted on the evening of 8/12/01