I am the proud owner of a 2014 CTS Luxury 3.6. Love the car, but thought I had nav when I bought it. Come to find out it was OnStar nav which sucks since getting used to my ATS nav. I researched here and was happy to find out that I can get the dealership to install it (at a price of course). Called my dealership and they told me it was not possible and I would have to get a new car. Not even the CUE in my car can be upgraded. Am I being lied to, or are they ignorant of how this can be done? Any help would be appreciated.