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For those without factory cd changer, I just installed the Alpine 6 cd changer in the trunk. It connects to the factory HU using the HU controls with an adapter called the gmasx. This gmasx also has aux inputs that can toggle between the alpine cd changer and whatever source you connect to the rca plugs. Since the vette has a 20 pin remote harness on the back (instead of the usual 9 pin), you have to connect an adapter called the gmh20t to the back of the HU. The toggle switch and the rca plugs come out of the ash tray bay.