Yes it would allow you to stream music via an aux cable. It is the round thingy. You can mount that anywhere.. I put mine under armrest by coin holder. PMdMay be interested. I have an 02 325ci w/ Biz radio but does not seem to have the Aux mode. Aux would allow me to stream music via phone?
Also, where is the Aux input jack located? I don't see it in the images.