That video was a little disjointed. The solid tube with no air filter flowed less than the same tube with an air filter. The most flow I saw was the solid tube, stock MAF, and an air filter. 20"H2O is a very small pressure drop, less than a psi. I don't see any of that as useful (not trying to sound like an ass) unless the inlet cfm can be characterized in mass flow.What a minor bend in a pipe can cause: