Carburetor scoops do they make a difference?

Ok but the thing is that Im not going to put a hood scoop on
My hood, I'm going to cut a hole in the hood so be carburetor can stick out and I will put what is called a carburetor scoop, you know those air blower things that mount on top of the carburetor with the butterfly flaps ? Well I want to put that on my carb but want to know if it will make a difference or are those things just for looks because jegs sells them for like 300 bucks
they look cheezy as hell to me, I wouldn`t put one on anything !