I have read all the posts on here and at lincoln vs cadillac's website as well. I just bought my wife a 06 Zephyr with the factory nav. I am wanting to add sirius (and maybe an ipod) to the fatory stereo without a modulator. It seems like I read that you can add the factory satellite on the nav. The FM2 on the touchscreen will change to a SAT button. Has anyone seen this and if so what do I need to do. Anyone know the part numbers. It also seems like I read also that the radio has to be "reprogrammed" I just do not know where to send it to have it done. Thanks for all you guys help.