When it comes to putting out big numbers with diesel power plants, Jerad Wittwer knows a lot more than a thing or two. As the owner of St. George, Utah's Performance Diesel Inc., he has to. Customers aren't going to drop their hard-earned cash at a shop that doesn't live up to their expectations, so his livelihood depends on it. His extensive knowledge of getting diesels to go fast and produce insane amounts of horsepower and torque came in handy when he purchased his 2006 white Megacab.

After picking up the Ram, Jerad had one thing in mind for the Dodge: Create a serious sled-pulling machine. With the help of his employees at PDI, he did exactly that when they transformed the stock 5.9-liter Cummins into a monster inline-six that produces 1,028-horsepower and 2,050 lb-ft of torque. Even with the potent Cummins to work off of, that kind of machismo doesn't come easy.

What you won't see when you open the hood and look at the block machined and balanced by PDI are six PDI pistons filling the cylinders or the PDI camshaft that Jerad conveniently forgot to share the full specs on. The head also received some semi-secret treatment, as the only details our interrogation revealed was that it has been polished and fitted with "oversized" intake valves.

Letting sleeping dogs lie, there are some details of the Cummins that are impossible to overlook. Hood open or closed, the massive ATS Coolflow intercooler mounted in front of the radiator stands out like a Betty White on the dance floor of a high school prom. As for the ATS Aurora 5000 Big Boy turbocharger hooked to an ATS two-piece exhaust manifold, that's not particularly a stealth piece of machinery either. At 90 pounds of peak boost, it takes PDI twin pumps sucking fuel through a FASS Filtration System and ATS/PDI EDM injectors to keep up. Making sure the air gets into the engine freely is an ATS intake manifold.