it seems that a lot of the problems that people have had with the 6. 7 is soot build up in the turbo due to the egr . i don't know a lot about the dmax or power stroke but i was under the impression that they have had an egr for a while now . i know the cummins has never had to have an egr up until now . if the dmax and the pstroke has already had the egr , why is it causing problems with the cummins turbo ?