Kelly .. you have a good point .. two things come to mind.
The stock hood vents ? Well from the looks of them on 9138 .. between the grilles and screens the measure maybe 12" x 4 " = 48 square inches x 2 grilles 96 sq inches ..then subtract the grilles every 1/2" which easily cuts the free area in half 48 sq inches then the screen .. every 1/8 inch .. cuts the free area in half again .. 24 sq inches then the mounting frame .. around the edge ... THESE STOCK GRILLES are eye candy .. they do practically nothing ... so with that said any other type of hood grille would benefit over the stock .... my opinion.
Ron
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