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The final power-product from ATS is the TorquePro 2000 propane fumigation kit. Propane acts as a catalyst to help burn up to 95 percent of the diesel in the cylinders compared to about 75 percent stock. This becomes even more important in the towing and extreme modes in which more fuel is injected into the engine. An option we chose on the TorquePro 2000 system is an adjustable orifice, which allows you to adjust from the cab the amount of propane injected into the engine.