I'm about to get the MKI9200 fitted, after deciding that the Phatbox was not for me and have found out that the cable set below is what you need to sort out the issues with the Bose and the rear speakers in the Audis. Apparently they have just been released to the market after testing.
10-402 - Adaptor Lead for Audi Full Bose Amplified systems Quadlock
A4 - Sep 05 > Concert Head unit Bose*
A4 - Sep 04 > Symphony Head unit Bose*
Telemute lead not available if Quadlock connection and Amplified.
These particular leads are required when installing the Parrot MKi9200 Car kit into an Audi vehicle with Full Bose amplified systems on Quad lock wiring.
All prices include VAT
They are also available from halford for about £75