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The 8.3 is not that much more heavy or big than the 5.9 (it is only approximately 4 inches both longer and taller, and perhaps less than a few hundred additional pounds - this thread says 1500 vs 1100 lbs), and has a MUCH bigger runway for power. It's safe, at similar levels of boost, to use a straight arithmetic comparison for the power generated between the 5.9 and the 8.3 usable liters on these engines, with the 8.3 about 40% bigger and therefore roughly that much more powerful than the 5.9.Thanks guys... wow from a weight perspective maybe a 5.9L is just as useful/powerful...