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Message: <blockquote data-quote="shovel" data-source="post: 1545833" data-attributes="member: 29855">[ATTACH=full]35719[/ATTACH]I tested the direction of air flow (on my 1996 V6 without those plug/valve things)  by taping strips of yarn both inside and outside the hood and then driving at various highway speeds while filming with an action camera suction-cupped to the windshield.      That car is stock ride height and has a reproduction stock air dam in place like how it came from the factory.    The yarn from inside was fed through the hole to overcome gravity and the perforated grille was removed to allow the yarn to move freely wherever air wanted to move it.   At highway speeds (40-85mph) the yarn from outside was consistently drawn into the holes,  at some lower speeds it would get tossed out a little bit sometimes.   [ATTACH=full]35720[/ATTACH]The green bit of yarn taped at the front of the hole is sucked in,  the green yarn taped beside the hole is drawn in pretty much the trajectory one could guess,  back and away from the center of the windshield.  The longer yellow puffy yarn from inside is pulled back but  the shortest yellow yarn from inside doesn't stick out & later when I cut the longer yarn shorter it all got pulled entirely back under the hood. My uneducated guess there is the resistance of the A/C condenser and radiator along with the air dam must produce a low pressure area under the hood and all the air which comes in the front must have no difficulty exiting below the car & down the trans tunnel.     I have no idea if the same is true for lowered cars or cars missing their air dam.As for the spelling I've been in the workforce 30 years and there really doesn't seem to be any correlation between the spelling of words and the aptitude of a person in their role.   I work within a team of engineers (electronics, not automotive) and there is a way of speaking - our guy in the youtube comments does pass the sniff test on that.    He could still be some twerp cosplaying for whatever weird reason but the stakes are low here so I'm giving him the benefit.</blockquote>