I will be getting my 2012 C7 A6 3.0t shortly, and am already thinking of what modifications to do.
A more aggressive rear diffuser / valance will be a start. From my searches I think the S6 will fit the S-line rear bumper mine will come with. However RS6 will require modification.
What other parts are interchangeable across the range that you have upgraded to, or know that works?
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