RE: rs6 or s6 wheels
You should be able to fit either wheel easily. The True RS6 wheel is "Light alloy wheels 8.5 J x 18 RS 30 in 9-spoke design" (from Audi training material.) That should fit with out complications. Same as the stock sized S6 wheel. Personally, I like the design of thr RS6 wheel better. You kind of get sick of the S wheels, and look forward the seeing the RS wheels rolling into the shop.
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Audi Technical Specialist
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