Carburetor scoops do they make a difference?

So if they don't work and are just for looks, then why do pro stock cars all have them?
I think it's more related to the design than looks.

Scoops or stacks? Both work, but in different ways. To make a scoop work properly, you really should seal it off and make ram air. Otherwise it is a cold air intake, which is not a bad thing either. Velocity stacks look great, but one sticking out of the hood looks a little weak, compared to 4 or 8!
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