I've not actually seen one fitted up, so could not say for sure, but evidence suggests it would work. They are both M54 engines. The SMG part # to mate to both engines is the same. The SMG and 6 speed manual are both the same GS6S37BZ box. The difference in gearing appears to be only in the diff. You'll need a different prop shaft as well. And of course with this sort of thing, there's likely unforeseen fitment issues that will need to be resolved.