I am tired of paying for Sirius since everything I listen to can be streamed at a fraction of the cost. Unfortunately, my 2007 A6 audio system has neither Bluetooth nor an aux input plug. I have tried to link via an FM modulator, but the quality is awful. I figure I must be able to add a component to provide me this functionality and would make up the costs quickly. Thoughts on how/what to add (preference for Bluetooth) would be appreciated.