I disagree and here is why: In a 6.2s case, you do not have a lot of airflow (at least compared to other light truck diesels). Now, at a low airflow, a given aftercooler will have less of a pressure drop than it would with an engine with more air flow (i.e. Cummins, etc.). So, if you were to put an aftercooler on a 6.2 turboed rig, you should drastically lower inlet temps with no more than a 1 psi drop (no firsthand experience with a 6.2, but it is a pretty well educated guess from dealing with other diesels). So what I am thinking is you would maybe lose 1 psi boost at the manifold, but you might cut the air charge temp in half (or even more if its a good cooler). This will obviously net you lower EGTs and will be much better for the engine. Also, if youre willing to risk it, you can of course add more fuel at this point. The question one has to ask I think is if the price tag and work involved in putting an air to air aftercooler on one of our trucks is worth it. If you are towing a lot or running an engine with say some low compression pistons and a lot of fuel, I would say its worth it. If its just a stock 6.2 with a Banks turbo on it and fuel turned up the recommended amount, I would say its not worth it.
