I have a 2007 GXP with the MP3 Single disc player. It does not have the XM module or option in it. Has anyone ever installed the GM Part: 19154567 which is the XM radio module?

I think it plugs into the stock radio and gives it the XM stuff.

Just checking to see if anyone has done this and could offer info on where it installs and if it uses the built in OnStar antenna like I have heard.

Any help is appreciated. I searched on the site and didn't find any info on this.