Anything over the top reduces flow, but the screens are the best you can do for filtering and not limiting the least flow impediment. This will all be tested at the track.
I bet they aren't as good as the filters. If you add up all those wires in the screen it takes up a good majority of the opening.
I am not carbed but I run two throttle bodies on top of a tunnel ram. I usually run it with no filters but running the small K&N filters don't seem to bother it one bit.
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