This is an old thread and most of the participants don't seem to be around anymore. When I test drove my 2016 it had a rattle and was the heat shield above the muffler. Mine was a constant roaring at highway speed. I told the dealer I bought it from and they took care of the problem but I don't know what they did to it. I've read of others who have had problems with the heat shields and that's where I'd begin looking.Hi guys! I have the same issue. Newman, have you ever found out what it was?