just became the proud owner of a 2004 tl. One of things holding me back was the xm installed radio and I would like to know if there is a mod out for it yet to change it to sirius. For me the factory radio has to stay because of the look of the interior and all the additional options associated with it. Help

 

Get a portable Sirius unit than and plug it into your aux on the factory unit... which I don't believe it may have. Perhaps play it through FM. I doubt there's a mod out there since many people would rather replace the factory unit for one that has much better and richer features.