Bought a '16 Navigator L recently and seems it's equipped with a Sync 2. Looking to find out ways of upgrading to Sync 3. From the research so far, it appears both Screen and APIM needs to be replaced with some programming for APIM. The options from 4Dtech and infotainment seems bit expensive and not necessarily targeted for Navigator, whereas individual replacement parts appear to be much cheaper. Anyone with information about where to get a upgrade KI