Since the seller of the item didn't think it would work, I have since talked to a dealer about re-installing XM to the car (that was my original goal).
I have read in a thread or two that people were wondering if the factory XM can be added to a car that didn't come with it and it CAN be done by the dealer.
I was quoted about $350 out the door including tax to get the stuff installed. From what I understand, this includes the antenna wire ran to the existing "shark fin" antenna, the XM Module, installation, and reflashing the computer.
The other thread mentioned they quoted them around $800 if i remember correctly, which is outrageous.