Can anyone confirm that installing the f-version of the RNS-E is plug&play for the '05 S4 Cabrio with XM? Or are additional parts necessary? What about the differences between the sedan and cabrio for the 05 type?
In Europe there are (were) two different devices, the 8E0 for the Sedan/Avant and the 8H0 for the Cabriolet. I never saw anywhere if there is a functional or technical difference. I also never saw a reference to a US 8H0 unit, it may exist or it may not. But Powertony is right, electrically both units are the same and fit in either model.
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