Sure the new Powerstroke 6.0 numbers edge out the Dmax but it has had far fewer problems than the Powerstroke 6.0. The 6 cyl Cummins is great on low end torque but doesn't have a very wide power band and is not nearly as fun to drive as the Dmax. It still performs and acts like an old school diesel.
All that would have to be done to the H2 to accomodate the Dmax is a front clip and hood lengthening and redesign. This is quite likely later in the H2's life cycle.
We know GM won't drop a Powerstroke in an H2 so I'll continue to wait for the Dmax and be damn glad if it ever comes to fruition.
A properly tuned one should be able to leave a Supercharged H2 in a cloud of pungent black smoke.
