The neat thing about diesel engines is that you can't run them too lean. The more air you put through them, the cooler they run, and the more power you make. With this information, it should be easy to see that anything that makes the engine breathe better, such as larger exhaust and intakes and most "power packs" (like the Banks systems) not only increase power, but torque and mileage as well. The downside is that a given engine design has only so many "horsepower-hours" in it. When you increase the power of the engine, you decrease its life span commensurately. If you take a 300 hp engine that is designed to go 400k miles before a rebuild, and make it put out 600 hp, it will only live about 200k miles.

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