I think that dodge sells sirrus, I've never listened to sirrus so can't help you with their stations, just that howard stern will be on soon. You will get better sound quality coming thru your own radio. If you go to an aftermarket unit, you will have to have a tuner, or fm modulator, which hooks thru your antenna. Then when you wish to listen to xm you simply tune to an upper station such as 89.1 or so. The quality is affected somewhat, But unless you are a sound afficianado you probably want notice. You will hear a difference in the loudness going from satelite back to fm, which is because you are going thru an fm modulator. I use xm delphi, Its nice because you can install the car kit in every vehicle and one in your home and you can have one unit and just take it in which ever vehicle you choose, plus i like there display also. I've had xm now for over a year and until I got the ram I don't think I have listened to fm at all, and can tell you that it does work coast to coast, very very few places I ever lost service, if so it was not for long . Hope this helps.