New Dart Hood scoops, Functional or not?

I'll be putting my scoops on the Dart this week. I wanted to get some suggestions on if I should drill the 4 inch hole for the air flow or just install the scoops for looks only. I'd like to have to holes for extra air flow into the engine bay but I'm worried about water from rain, dirt, etc. I haven't seen if there is any type of filter set up for the holes. If anyone knows, tell me where to get them. For now I'm just installing them for looks.