Quote:
Originally Posted by Tango Charlie
Before MetroMPG yells A'It depends!'(tm), let me say that generally it's better to block the upper intake.
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No, I definitely would have suggested blocking the upper as well.
The logic behind the choice is it's better to deflect air that's already above the stagnation point over & around the vehicle than it is to permit it to enter the aerodynamically dirty engine compartment (and exit contributing to turbulent flow under the car).
As for in front/behind the grille, there may be practical reasons for choosing one side over the other in case you need to remove it (in the event of temps getting too hot).
And I like the idea of "outer"
because it draws attention. Maybe it'll help get people thinking...