Was coming back from Traverse City today with my bro in law when he says to me "this guy behind me really wants to get around me. See, listen, you can feel it every time he accelerates. It is vibrating the interior. He is just aching to get around me. " So I look in the side mirror and tell him it is a 94-02 Dodge Dually Cummins powered with stacks. Mind you it is dark all I see is lights. But can hear the definite growl of a cummins. the stacks were a guess. Well he finally passes us and it is exactly what I said. Green dually with stacks. License plate:blwnsmk. He was impressed. We were in a blue Chevy Tahoe between Traverse and Kalkaska. You lost us at the turn back on to 72 between Kalkaska and Grayling. . Again nice truck. See you around.