will they fit

May need spacers because i think the offsets are higher on the b6's. But the stud pattern is right.
 
I agree with Dave. It's a very common mod. Looks really good and makes a big improvement considering how similiar the wheels look.
 
Yup don't listen to me :sorry: i'm thinking of the newer audis with the 54 offsets.
 
I think Random is right, you will probably need 5mm spaces or bigger.

I enquired about this before, and SatanS4 had them on his B5 S4 - he said it was a very tight fit and when he fitted new brake pads, the calipers where catching on the spokes iirc

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He has RS6 front calipers which are much larger than stock. The B6 rims have a 45mm offset if that helps (can't remember what the stock B5 S4 rims are).