Billy, your car looks awesome! :)
Its hard for you to see this obviously since can't see the cover first hand but it is a fairly tight fit around the housing it kinda forms around it. Also with air pressure from under the car moving thru the engine compartment toward the bumper area and thru the hood vents what might escape out of that cover would probably be diverted thru the bumper vents or up thru the rear part of the engine cover.