Quote:
Originally Posted by knucklesplitter
Preliminary tests using small pieces of string tied to the mesh in the vent indicate that air flows *into* the "vent" at speeds greater than about 30-40mph, but I want to do some more fiddling before I'm sure.
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That's what I would have guessed. If you're just trying to reduce heat in the engine bay during regular driving it'll work great; if you track the car and are looking to reduce aero lift, then it's hurting you.