I am getting a lot of exhaust in the cabin. I drive a 2500 HD. 2 different dealers have check the engine and can not find the problem. Is anyone having this problem? if so how was it fixed?

And you're complaining?

God I love diesel smoke.

Take a look at the firewall, all the rubber grommets going through it. they should all sit flush on a lip, on the grommet. Check the exhaust pipe too, right after a cold startup run your hands around it and see if you can feel any exhaust leaks. You have 2 vents on the rear left and right of the cab and you might be getting some in from there as well, the plastic louvers might have gotten tweaked and not be aligned right. Only things I could think of.