Original post was for a 2004 Civic Hyb and there is no factory XM radio setup for this car. I have a 2005 and bought a Delphi Roady2 for about $50. It works very well in the Hybrid and many other cars I have tried it in. I just got a Garmin 2730 GPS with the XM radio built in and it does not work well with the FM transmitter like the Roady 2. I would get the Roady2 and be done with it rather than have some stereo shop butcher up you car adding something that will work no better.

As for the 06 HCH2, I would do same, but connect the Roady to the aux input jack and it should be great and you can save yourself $600 plus for the stupid complicated factory install! Honda should get a F for this complicated option.