Hi all, this is my first post since joining the TDR. I thought you might appreciate this. I have a 2002 Cummins that is mostly stock. I also have a bird dog (lab g. shorthair cross). We have noticed that since I started driving my Cummins, he gets excited and barks whenever a Cummins goes by the house. We get a lot of Diesel traffic by the house, but he only barks at Cummins. It is not a mean bark, it is a bark that says take me along. That is one smart dog if you ask me.