Adding the Factory XM is not an option, as GM does not sell the digital tuner as a part.
There are a couple of adapters that allow you to connect a Pioneer XM module to the factory radio.
Also, there is a new adapter that allows AUX inputs to your factory radio. You could connect a SkyFi directly to this adapter.
Do searches on PIOGM1, AAI-GM24, and XM.
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