I just bought mine last Friday, used at 11,680 on odometer. That squeak is there, even at that mileage. YES!!! It is most embarrassing! First thing out of my wife's mouth, was that truck is squeaking! I'm taking it to the dealer next Friday to see what the deal is. I'm not understanding how an exhaust would squeak though? Its clearly sounds like a belt isn't lined up correctly. And from all the post I've seen, it's definitely a manufacturer issue. The fact that the once the truck warms up, it tends to go away; kind of puts me in the thought that the belt, or pulley has warmed up enough not squeak. I am interested in seeing if the upgraded exhaust changes that. I just don't see how it will. Who knows, maybe I'm completely off here. But that squeak has gotta go!!!