 Road construction made it...  Road construction made it tricky to get to Pro Power, but Luis Otero sent up a smoke signal to make certain that all of the other dieselheads found their way. |  The rollers were turning all...  The rollers were turning all day long. Jeff Argo, president of NMTDR, made 521 horsepower from his 12-valve Cummins. |  Yes, that's right. Clayton...  Yes, that's right. Clayton Spurgeon has a 5.9L Cummins engine under the hood of his F-350. And it isn't just any Cummins, it is a twin-turbo 12-valve that made 532 horsepower on the dyno. |