I was thinking of ordering one of these from Germany and seeing how (or if) it would work with my OEM Bluetooth retrofit. I am using the "C" revision module with my "P" RNS-E unit, both are retrofitted into a 2000 (B5) S4. I know there was a plug for it already built into my Kufatec harness, so is it just plug-n-play? Any info on this? Thanks in advance?