I did not see anyone mention the horsepower difference of the two models, due to lack of radiator/cooling in the 40 ft and entertainer shells. The last published specs said 455HP/12.7L version of the Series 60, versus the 515HP/14L version of Series 60 the the MH shells were equipped with. I have not heard of what the engine HP difference will be yet for the Volvo Engines versus models, but there has to be a difference for the same fundamental reason as before with the Detroit engine use.