From what I’ve picked-up it’s the volume of air (and preferably cold air) that is more important than the size of the filter or the “hat”. What about the type of flow? Ran across a product called Tornado http://www.tornadoair.com/. To quote:
”the TORNADO is an automotive air channeling tool that creates a swirling air motion, allowing the air to move faster and more efficiently by continuously whirling air around corners and bends - imagine a mini-tornado on its side moving through the intakes of your automobile. It causes better fuel atomization, resulting in an increase of gas mileage anywhere from 7-24%. These figures are confirmed by road testing performed at an emission lab licensed by the EPA. Dyno testing shows 4-13 added H.P. as well!"
Is there any truth to the claims?
If this was used in combination with Tony D’s intake kit, would it provide even greater improvement?