A few chaps on the B7 forum have this is or a very similar one fitted.
They are not the best fit and do require a lot of fettling to get right, also they use a non s-line grille so a genuine rs4 grille wont fit .
A very personal choice really, a marmite situation, for me they are not in keeping with the B7 shape, fine if it's for a B8 or beyond but just too angular and boxy in my opinion, but hey personal choice really.
Also not really an rs4 style bumper, well not a B7 rs4 that is.
The B7 is very rounded with smooth lines, all those shouty aggressive air intakes just look out of place.
just my input