I looked at many of the aftermarket units. None looked as good as the factory Delphi NAV. Plus I didn't like what they all said about the steering wheel controls, onstar, etc. At best they said we "might" be able to make them work but no guarantees. Plus, their price including install was a great deal more than the factory installed by me. So I went with the Factory touch screen Nav, XM tuner & 6 CD changer under the rear seat. Everything works perfectly including all SW controls & onstar. And it sounds very good. This is my recommendation.
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Jonahs
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