Even for the diesel truck owner who swears he’s, “not going to touch this one,” the temptation to add an intake, tuner and exhaust to a stock truck is too tempting to pass. And for those die-hard diesel enthusiasts with plans to double the horsepower one paycheck at a time, the first steps taken toward that dream build also start with these same three modifications. Have you ever wondered why most diesel truck owners—regardless of how much or little they plan to do to their truck—seem to always include an intake, tuner and exhaust upgrade in their plans? The answer is actually quite simple, because these three modifications work! Without these upgrades you’ll be overpaying at the pump while leaving added horsepower bottled up if you choose not to touch your stock truck. Still not convinced? Let us prove it.