If you have the factory radio you're basically SOL; I think the only way you can run a Sirius is to stick a dock on the dash and kludge wire it into your factory radio. I don't know if you could fit a factory radio that includes XM; frankly I wouldn't try.
If you replace the factory radio with an aftermarket radio there are several options. There's
a dedicated Sirius radio that lives behind the dash (there's plenty of room in there) and connects to the back of your aftermarket radio. You'd need to install a PAC SW interface if you want to keep your steering wheel audio controls.
You can also install a
Sirius Connect Dock in the center console. Your Sirius portable radio plugs into the cradle and the cradle plugs into an
adapter that plugs into your aftermarket radio. This lets you control your Sirius from the radio and completely hides the Sirius radio, but you can unplug your Sirius and take it into the house and plug it into a dock connected to your stereo.
Bottom line: it's possible if you replace your factory radio with an aftermarket radio.