Crizila pan looks like it will work,should have enought volume. Then I am not and expert on air flow either But I have found on mine & a few others you can have to small or not big enought of a entry & it will hurt the HP,have yet to see one that was so big it hurt the HP.

Mr_P, Would it not be better to have the hole somewhat the shape of the scoop,than say a somewhat square scoop with a round hole? That's only a question,not saying its better. Just trying to learn all I can.

PS I even painted the inside of my scoop hoping it being smoother it would help the air.