h2daddy,
It sounds like he is using an FM modulator to run the sound through his stock system. I believe the DVD/XM tuner sends out a signal on an unused frequency around 89.1fm or there abouts and the stock radio picks up the sound like a radio station.
I am doing the same thing to my H2 but I am hardwiring it using an after market device you can check out here. [URL=http://www.logjamelectronics.com/soundpiogm1
I just ordered it so I'll let you guys know how it works out.
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