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I believe Carl is correct, from what I have read Cummins has had to detune the diesel to meet the standards, less hp and less torq for same displacement. Chevy 6.6 is 397hp and 765 ft lbs torq, Ford 6.7 is 400hp and 800 ft lbs torq., and Dodge 6.7 is 350hp 650 ft lbs torq. In addition Chevy and Ford are getting better mileage. 50hp and 150ft lbs torq is quite a difference for the same size engine.
Bill
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