So another variable is the shape of the intake runner. A tunnel ram has a straight shot to the head port whereas a single/dual plane there is a bend .
Imagine standing in an alley way between 2buildings on a windy day... thats a tunnel ram. Now step around the corner just 1'.. the wind is no longer blowing on you . Thats a single / dual plane.
The point is that with a single/dual plane there wont be equal amounts of flow around the window.
Is my thinking flawed ?