Who is the Dodge Cummins Expert???

[jordy]

So the 5.9 is the engine without all the regs and better fuel economy and the 6.7 is the newer one?

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Yes. At least in my opinion. The 6.7 was a response to increased regulations and the choking of the 5.9 by the emissions posse, or so I've been told. Ford did the same thing with the increased displacement to offset the loss of power. Think of all the regs as restrictor plate races in Neckcar to put it in simple terms.