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The original grille block left a slot about 1 1/2" wide just below the bumper. The new nose only has the opening you see below the license plate. I designed it to function sort of like a NACA duct. There is a piece just inside the opening that directs the air upward toward the radiator. The floor of that opening starts at the narrow part and deepens as it widens. I have climbed Wolf Creek Pass in 95* summer heat and had no issue with engine temperature. The diffuser under the rear starts at the rear suspension framework, ending at the bumper cover and opens up 5" and widens 7" toward the rear. The key to diffusers working is that they have to see the ground between the fences on the sides. This separates and smooths the air flow as it controls its expansion out the rear.
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