No idea if my 2001 A6 4.2 has the stock or sport suspension - do all 4.2 options come with sport suspension? Is there a code in my VIN # to figure this out?

 

There is a code in your maintenance logbook and the spare tire well. I can't remember where the corresponding list of codes for sport package is online, but if you google and search around I bet you could find it.

Once you have those two things you should be good!