[Palmetto Fellow]

Have you ever considered buying a Bluetooth device with a stereo out plug to interface with your Honda?

You could stream audio via A2DP, but when a call comes in, it will likely use the car's speakers and a mic built into the bluetooth device for the call audio.

My next car will have a stereo that supports A2DP so I don't have to use an FM transmitter or the method I described above to stream audio. Maybe I'll just buy a car stereo with Bluetooth...