I know even on the 6pk scoops I heard it helped to just raise the opening a small amout of about 1/4 to 1/2" like on the 6pk scoops. Just to get the opening off the hood and raised any does help from what I hear. In other words have it so the bottom of the scoop opening is not right on the hood as I believe it works better to raise the scoop some even if only a 1/4" to get the scoop up in the air stream and get the opening off the hood itself. Like what the snorkel scoops did in Pro Stock in the 70's. Actually going by that standard means my Max Wedge scoop really dont work good at all the way it is like they were stock. I believe the trick on the front open scoops is to get the scoop up in the air flow better as flat on the hood is not as good air flow into the scoop. Ron