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So it looks like the aftermarket mic is required unless you tap into the factory onstar mic at the OnStar box behind the glove box. I found a thread here on how to wire it, but after spending about an hour trying to figure out how to match up the wire colors correctly for the splice (since manufacturers of 3.5 mm cables can't seem to adhere to a color coding standard), I gave up and just hid the provided Kenwood mic above my rearview mirror.
I've compiled quite a bit on information from digging around on this site and other sources while doing this install, so I think I'm going to put together a how to guide to help others out once I'm done.
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