If this is in the wrong forum I'm so sorry. Looking to see if anyone knows how MediaBridge will work with an M Roadster with DSP/HD RADIO, factory bluetooth and Nav. Basically I want to know if I can use the MediaBridge bluetooth to stream music through my radio using an IPhone 4 that is playing an App like Sirius or Pandora, also anecdotal accounts of how well it works. Since my car came with Bluetooth, can I just use the MediaBridge to stream music from an App via IPhone 4, but still use the factory Bluetooth and microphone for phone calls? Or will using the Bluetooth to stream mess up using the factory system for phone calls. I've seen a few posts saying there MediaBridge didn't work at all after trying several units. Is this just an issue with HD radio/DSP, or just in general?