The intercooler's primary job is to cool the charged air prior to entering the combustion chamber. The result is more oxygenated air, which allows for more fuel to be transformed into power. A byproduct of this process is lower exhaust gas temperatures (EGTs)-a good thing. This is extremely important for pulling large mountain passes during towing scenarios. As engine load increases, operating temperatures also rise. As things get hot under the hood, heat is absorbed by all materials in the engine compartment. This effect is referred to as "heat soaking." The intercooler is a diesel engine's primary defense to heat soaking, and that's why an intercooler is so important. Gale Banks said it best when he told us, "A diesel engine is not complete without a turbocharger and an intercooler." And we think he's absolutely right.