I don't know if it's changed, but back in 2006 when I got my A3 w/ sport package (now called S-line), the "OEM" lip, sideskirts, and rear was all made by Votex, which is actually a subsidiary of VW.
The newer S-Line front bumpers have a bit of a lip, but it's not the same thing as the actual Votex chin, which is much bigger and more aggressive.
Here's an interesting article about it -
http://www.vwvortex.com/cgi-bin/artm...ive=6&num=1015
Scroll down to the "Votex parts" section -
http://www.ecstuning.com/stage/edpd/...egory=Exterior
Here's a post with lots of pics of a votex kit installed
http://forums.audiworld.com/a3/msgs/40828.phtml