Tracked the car in the rain on the weekend and got the intake filter pretty dirty. I think the dirt came through the vents in the vents in the fender skirt.

If I plug those holes, is there enough venting elsewhere to properly feed the intake?

 

hmm.....i would assume so......there should be plenty of air coming thru the front air-dam......you can also remove some plastic thingy from the right side of the radiator to increase flow