I second that proposal. It's disappointing that these units don't have the capability for FM transmission of the audio to the vehicle's entertainment unit as did earlier 6x0/7xx .....
Maybe it would be better to continue this discussion over in this thread?: [Only registered and activated users can see links. Click Here To Register...]. Quite OT here. There's already been a bit of discussion over there about the mount which dasilvarsa was involved in too. It seems a far better and less invasive option to add a surface socket to the mount rather than glue something to the 3xxx itself as the OP there did. Single channel out is a bit of a pain if that's correct though. :(