You need a 4B0 unit and your old nav system will need to be disconnected. If you have a telematics (I dont think so in 2002) then you'll need to jumper some connections in the navigation harness plug after you disconnect it. This is so the telematics speaker will remain active.
see my link in my sig (via quicklinks). Start there.......all your answers will be covered. (RNS-E for C5 A6). I have a very...very long thread for the C5 community. Happy reading.
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