You would have to buy an aftermarket headunit that is Sirius capable. The factory headunit is XM only. If you want Sirius do not order the XM option.
The only option to get Sirius and stick with the factory headunit would be to buy a Sirius reciever and have an FM modulator to play it through an unused FM station. Quality is not the best with this set up. I don't know much about the Sirius hardware out there now, so I can't recommend a model or manufacturer to look for.
No dislike towards the XM, just some of the show's a regularly listen to are only on Sirius like the Podshow lineup. Oh well, I can just stick with downloading podcasts to the iPod and listening that way. Speaking of which, is there anyway to plus iPod's into the factory stereo? Other then an FM modulator?
Also, thanks for the satelite info, excellent info I wouldn't of been able to find otherwise
Is there a step by step instruction on how to place an aux jack into 06 G6 GT radio head unit? I have XM. I want to install the XM sure connect in the rear of the head unit. But, if I am going to go thru that, I might as well place an aux jack. Thanks for your help.