Originally Posted by TayMC197
I'd super charge it and ditch the turbo. You have no air circulation for the intercoolers, you can't have water going through the turbo, and you can't install the water inlets post turbo or your manifold temps will be hot enough to melt things. Super charging it will be the best option for you in this case and fairly easy to do. The heat will be to great with turbos. Now for the exhaust, just straight pipe it with standard water manifolds and zero filtration. If you leave the engine on a stock tune, the amount of black smoke and emissions is low already. Pushing a prop you won't have near the load on the motor that it would in a truck. Also the gas manifolds and exhaust won't hinder the restriction of the duramax (IMHO).
Water to air inter cooler will be used. They are very efficient in restricted air flow applications. We want to use a stock motor and turbo for cost effectiveness.