Quote Originally Posted by TbM View Post
i would of thought a headlight intake would help depending on the normal intake location, taking air from a higher pressure zone logicly should aid the intake, hence them using those front open intakes on supersports bikes n drag cars ect.
Well think about it this way;
If you place the hole in an area of large wind resistance (Lower in your front bumper, obnoxiously large hood/roof scoop, etc) then it will tunnel air into your intake.
But if placed on an aerodynamic surface (Say an Evo-like hood vent, or a headlight intake on a sleek and sporty car) the air is supposed to flow right past it normally, but since you've put a hole there all that's going to happen is cause low pressure just inside the entrance of this hole.

I've read a couple of articles on this 'Headlight Intake' business, feel free to hunt around.. But they all seemed to have reasonble proof as to why if they were affective to your Engine, they'd be detrimental to your Aerodynamics.. And it would outweigh the benefit in most applications.