Yes, we have a 2016 MKX, we have complained about exhaust smell since day 1. It has been almost 18 months, the car still smells to this day. We finally got the dealer and Ford to admit, there was a smell, which they did reluctantly. We were told in Dec 2015, that a emissions software update was coming in the 1st quarter of 2016. It's February of 2017, still no update.
We smell the exhaust when getting on the freeway, doesn't matter what the temperature is hot or cold, or the air settings within the car.