Hi Guys I know this is a question thats been asked loads, but I cant find it!! I'm wanting to swap my existing Symphony II to a Symphony II+ with MP3 compatibility. Can this be done on a 2006 A3 with Bose? If so what leads do I need and, where do I purchase them from and do I need something for the ariel. Any help would be greatly appreciated or links to posts expaining the procedure. Thanks