XS-Power 3" DP's
 

I wonder does this downpipe fit directly to audi s4 b5 original turbos (K03), or does it only fit RS6 turbos, what's the difference between these two turbos flanges?
It would be a big help if someone could help me out.

http://www.ebay.com/itm/322024382598?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT