Souping up diesel engines for more power is a COMPLETELY DIFFERENT ball game than doing the same with a gas engine.

With a gas engine, anything you can do to improve breathing will add power, more fuel/air in results in more power out.

In the case of a diesel, however, improving breathing by itself does NOT result in more power. Remember, the power is regulated by varying the amount of fuel added to the combustion chambers. Without other modifications, the only thing that an opened up exhaust would do would reduce pumping losses. The effect of this gain would probably be immeasurable using even the most sensitive of dynamometers.

The factory added power with the turbo and other breathing improvements and THEN providing more fuel in the combustion chamber. The added breathing allowed additional fuel to be added with no ill effects.

Even though this is all scientific fact, there has been much debate in this forum regarding this. You can debate laws of physics all day long and they will not change. I suppose that some believe that if you debate it long enough, you can make the Sun rise in the West.

Have a great day,