I have a 2006 A4 with the RNS-E mk1 sat nav. I want Bluetooth for phone calls. On eBay the modules seem to be going for around £150 with loom and microphone. Would it be an easy install and do I need to get it coded ?

Alternatively would something like a parrot Bluetooth mk9000 work as well. Can that be configured to display on dis and rnse ?