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I was under the impression that the KCA-XM100V is the only interface unit I need for my DNX8120 to get XM radio.  The CNP2000 XM Mini-Tuner....is that a turner unit that is also needed to work with my DNX8120 or is this a universal turner unit that will work with my other 3 cars without a XM radio ready HU?  Please clarify, thanks.