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The vcim Bluetooth swap is a big one. 2012 nav is a big one black bear tune a big one.
If you get a vcim from a 09 and better it allows you to connect your phone to the truck Bluetooth. You can now use hands free calling to your truck with your current phone. There are long threads on it. Check it out. It does NOT allow you to stream music.
Why would anyone dump the 6 speed and the awd? Seems like a waist.
My favorite mod was upgrading to a duramax.