If you get an e-mail like the one in bold at the bottom of my post just go to this site
www.sirius.com/optimize and follow the instructions. They will send you a free FM modulator valued at $20 and a free installation card. I did not use the install card because I did it myself. I have the XACT Visor, which has a very strong built-in wireless FM modulator but it does sound better with the wired one.
Here is the FM Modulator that they will send you.
http://shop.sirius.com/edealinv/serv...dParentID=7872

Here is the install card that they send:
http://shop.sirius.com/edealinv/serv...dParentID=7872
Here is what the beginning of the e-mail is:
Your SIRIUS radio contains an FM transmitter that allows it to operate wirelessly through your car FM radio. We have determined that the output of this transmitter exceeds the limits established by the Federal Communications Commission (FCC). As a result, the unit may interfere with the performance of radios operating in areas adjacent to your radio. There are no health or safety concerns associated with this issue.