[iversonm]

Hi,
Just wondering if I could hook up any Sirius unit available to my 2005 325i headunit through BMW aux input (which I have and plan to install)? Has anybody done this? Is there any difference in sound quality vs. hooking it up directly to the CD Changer input in the trunk?
Thanks.

Yes you can, assuming it is a standard Sirius unit that would ordinarily use something like a tape adapter to connect to a car stereo. I'm not familiar with the Sirius product line, so I can't help you with specific receivers.

In my previous car (325) connected an XM Roady 2 in this manner. The hard part is figuring out where to put the thing on the dashboard. There isn't much space.