Aright been thinking about the design and theory of the front bumper/ grille on my van. My biggest concern is cooling and road handling. What I've noticed that people do is put an air dam on the bumper then leave the space between the bumper and core support open. Even the Chrysler TSB shows fitting a dam to the bumper then drilling holes in the "flap" between the bumper and the core support. To me this idea doesn't work, the air dam on the bumper creates a low pressure behind the bumper but in front of the core support. This would cause air to be taken away from the radiator/intercooler. My theory is to fit an air dam to the core support and either remove the lower portion of the plastic bumper or fit an aluminum bumper. This would create a low pressure area in the engine bay pulling air through the radiator and sucking the van to the ground. Also the radiator will not only feed from the grille, air can feed from under the bumper, in front of the air dam. This is how most newer cars work.
Any thoughts of this? I could make some pictures but I'm on my phone.