I'm getting ready to install a water to air intercooler on El Troque and have been looking at all of the available options. It looks like the simplest / cleanest / most compact unit that has good capacity is this: Water to Air Intercoolers It is pretty good size and square with a straight through air flow, which is perfect. It fits right where the cross tube sits on top of the valve cover. I will put some insulation under it to reduce the ambient heat transfer from the top of the engine. I realize that one placed in a cooler spot may be slightly more efficient but also know that the extremely short distance and straight through design will gain a significant amount of efficiency compared to a couple of feet of bending air tubing, some of which is going to run right across the top of the engine anyways and pick up the same amount of heat or more. Any thoughts from you guys who have installed or studied water to air intercoolers on a Prado? Thanks!