Here it is as we were leaving AEV, the first ever Cummins-powered four-door Jeep Wrangler. Though it looks like a short four-cylinder engine, there are in fact two more cylinders of this massive 5.9L, 24-valve, 325hp, 610-lb-ft of torque diesel engine hiding back under the cowl. Note the S&B air filter and the Optima blue-top battery. Many people told us we would need two batteries to crank over the Cummins, but we never ran out of power from this single unit. That includes starting, winching, and powering an ARB fridge/freezer as well as a Lowrance GPS, Sirius satellite radio receiver, CB, and multiple cell-phone chargers over the course of the week.