Bluetooth Install
 

I have just purchased a 2005 A6 with the RNS-E unit fitted . How easy is it to fit the bluetooth interface unit to the vehicle or does anyone have any alternative suggestions as to how I can utilise the BT capability of the RNS-E unit with after market products

Many Thanks
Todd

RNS-E doesn't have any Bluetooth ...
 

you need to add the OE Bluetooth if you want full integration.

You can get kits from e.g. Kufatec that include the model, the antenna, the microphone and the wiring you'll need.

See www.navplus.us for posts from lots of guys who have done the retrofit.