MTF is correct, the hood vents are there to get rid of the hood pressure, and extract the heat, while in motion, I'm one who made the factory holes bigger, and the MOD was created by WIZ1500, the only time you can tell is when your at speed, and use your wippers, you can see the differance with the washer fluid, from stock to opening them, I would think if they were ment to take in air, the louvers would be facing forward, but its awesome to have that machining skill.[/QUOTE
As @
J DAMAGE noted by dredging up a post from 2014, I too, opened up the holes in the hood under the vents. As the inside edges of the holes are close to the windshield sprayers, I made a triangular addition to the opening rather than a rectangular one. There has been no effect on the windshield wiper spray pattern.