I don't have the Bose system, and there is no "SAT" button,,,Can I still install an XM or Sirius Satellite Radio?
It is an '06 auto coupe...

 

I'm pretty sure you can. Instead of using the button, it would just send the signal through one of the FM channels instead. I've had SAT in my car for a little while now, it's ok. I think audio quality could be better, but I like not having to switch stations for commercials.

 

The 05-06 Bose stereos do not have a SAT button.

You cycle through pressing the radio button.

FM1 -> FM2 -> XM1 -> XM2 -> AM

I believe that was the correct order.