Our Enhancer propane kit is designed to help you with your mile increase on your fuel on any diesel truck with a turbo. This is a Progressive System that is activated by the turbo boost pressure, injecting vapor propane in increasing amounts through the air-intake as the boost pressure level of the engine increase. The progressive valve begins opening allowing the propane to increase as the boost pressure increases, and then as the boost pressure lowers, the propane flow decrease. The propane works as a "catalyst" when combined with the diesel fuel. When the propane vapor is added to the diesel fuel, almost 100% of the fuel is burned (as opposed to 75% without propane injection) which is what gives you the torque, horsepower and fuel economy.