I had the pleasure [using that word loosly ,very loosly] of installing an XM radio kit into a new Armada today. It is prewired for the sirus or Xm kits. I dont know how much the kit is I didnt ask. But here is the warning the instructions for it are very sadly wrong they dont match the parts you get in the kit, they are not really correct for what your looking for under the dash. There were several things I had to do to make the kit work in the car but the end result was it was installed correctly and functioned properly. If you do get a kit through away the template for the antenna its not for the armada its for a maxima. you have to measure out where your gonna lay it.

If any one attempts this over all its easy once you figure it out. But post here if you have questions about installing it.