you could get a double din fascia and upgrade to a RNS-E.
someone on here put pictures up, spend a few hours using the search.
i have gone from a RNS-D to RNS-E and its bloody marvellous. the upgrade path from D to E is fairly straightforward and just needs a couple of adapter plugs and two wires soldering.
the concert upgrade might be more involving!
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2001 S8 D2 
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