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The straight-six 5.9L Cummins 6BT out of a '90 Dodge fit in the Cruiser like a black dress on supermodel: tight and sexy. The engine bay was built for the Toyota gas straight-six, but the Cummins is a little bigger, and though it gets nearly twice the fuel economy of the gas hog it has less horsepower but nearly twice the torque. Adding an intercooler and mechanical fan would definitely take some more work to the engine bay.