We tried one of these transmit to FM type Sirius Radio things back few years ago. It wasn't this particular one but it was the same principle. It was a Starmate that Sirius was selling. When traveling it was just as difficult to find a FM station you could transmit to as it was to find a local radio station to listen to. If it has a audio output that woudl be a better way to wire it into your system. Maybe they are better now, your mileage may vary.
2013 Vision Sunset Red - Stage 1 exhaust, VictoryHID Cyclops
2004 Kingpin - Traded