With thanks to Scott the RNSd went in today. The B6 one didn't fit, so I bought a codeless C5 one and swapped the backs over. I'll probably source a code for the B6 one I have spare now and sell that on as there aren't many about in that fitment.
I had a Parrot hands free kit in the A4, and was never very impressed. I have a Nokia CK7W years ago, and it was simple and brilliant, so I bought another one, removed from a T5 - £20, ideal. I like the simplicity of the button dial, I'm not one for complicated screens and gimmicks etc.
The install went well, used these guides to work out the speed sensor source and that was it really.
http://www.f1computers.force9.co.uk/Downloads_Audi/RNS.pdf
Audi A6 Symphony II to RNS-E Retrofit: How to Update Your Audi With 2010 Electronics (GPSmagazine.com)
Biggest pain is the CD changer doesn't fit in the glovebox like on the A4! I find the C5 glovebox quite pokey and to mount it on top would obscure the light, I might have to relocate that, not sure yet. I see the OEM C5 ones are in the boot, my lead isn't long enough for that! The stereo mutes for the phone, but I get no audio which is annoying, so I need to sort that out but it can't be much. I need to sort the changer and tidy up the Nokia/TMC boxes behind the glovebox anyway.
I think the D suits the C5 interior very well.
I'm sure it will be fine there!
Pleased with the day, thanks to Scott
