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    GMAC Installed XM to Sirius Conversion?

    Yes it can be done and with excellent results. Went from XM to Sirius in my '05 Sierra Denali.Swapped out the stock head unit to a Kenwood 8017 with Sirius and they were able to use the stock XM antenna,as I also didn't want a third one up there,counting Onstar too. I have absolutely no...
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