HUMMUH,
I have heard that as well. Maybe I will see if I can find someone w/ and FM mod unit and try for myself. It would save a BUNCH of money and would prevent tearing into dash.
Also, you could probably use the "modular" type units that can go from car-to-car, or car-to-house. With the P-bus type, the unit is "dedicated' to the H2. BUT, with the P-bus type, you don't need another interface mounted in the cockpit since the head unit would act as the XM interface.
Decisions...decisions....
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