I'm thinking of getting Sync 3 with navigation and having it installed on my '15 GT. Does anybody have an idea how much it would cost with install? Ballpark figure will do! Thanks in advance!

 

Post is 6 weeks or so old so don't know if you're still considering this. But, the parts run $600-$800. Install, from what I can tell, is not that difficult if you've done any car audio at all. Really it's mostly unbolt the old stuff and bolt the new on. Worst part looks like getting the interior trim off. You may have to get Ford to flash the software though as the Sync 3 displays the car VIN where it shows the software info. YouTube has videos on the swap by one of the companies that sell the parts.