I don't know about alpha drives but that is the biggest water intake I have ever seen and was probably designed for a non planing hull. 4" x 6" x (2"?) is enormous, my Blackhawk drive intake on the skeg was a slot about 2" x 1/2" and that cooled a 540ci motor. For that thing to deflect water 5" over a 2+' distance seems like a certainty to me.