This is my first post on here. I don't really know much about the performance aspects of the duramax, but I love watching truck pulls. I mainly follow the pulls around northwest pa and eastern ohio. I noticed this year that all the duramaxes have disappered from the pro-stock class. It is all cummins now. What happened to them all? There was a couple of them the last few years, but this year I've only seen a black one that's new a couple of times, but he seems to be still working the bugs out. Anyone know what happened to them all?