[quarque]

Originally Posted by can't stop spinning

aFe Air Intake Toyota Tundra Review with Video Sound Clips | tundraheadquarters.com

there's an explanation in there somewhere as to why there is that opening in the airbox

I wonder if anyone has thought about a slight mod for the AFE box. The opening that lets in air from the engine compartment is there because the fender hole is not big enough at high RPM's. My suggested mod is to steal an idea from the design used in my Buick Rainier air box. They had a sping-loaded flap that would partially bypass the filter at extreme RPM's so the engine could breathe properly. The trick would be to find a proper spring so the flap only blocked the opening below 3500 RPM or so. Should be easy to do for some mechanically inclined user here.