If so how did you (or the istaller) do it?

This is Audis fault and not XM. The units did not work with Audis set up. Evidentally, that is on the mend.

how about the Delphi XM Roadie or Skyfi....is there an
auxilary output to power MP3's or to install an FM
modulator and then tune into a dedicated FM station
for output