CAN I ADD A "XM " RADIO TO MY 2007 S550 ??

 

Yes. There are portable units that you can put in your car that will play through your car stereo and then you can take them with you if you want to play them indoors or in another car.I have the factory mounted type in my truck and it works great but it's ONLY in the truck,so I am cosidering getting a portable unit myself. Any of the larger eletronic stores will carry them, good luck and turn it up!