With a diesel you'll want more breathing than a gas engine on the exhaust side, i'd run 2.5 inch minimum, maybe 3 inch oval and then split it in the back into something normal looking like 55PG said.
Also like he said, there's the cost of a cummins, and all the accessories (fuel injection system, etc. Those are mechanical right on the engine right?)
If you wanted to be top of the line like packard intended, find a caterpillar engine. If you want to be different and quirky, find a detroit diesel two stroke
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