Quote:
Originally Posted by zornet
3rdclas is SO right on this… Why would you try to force air into the right side where the fan is attempting to exit or blow OUT the hot air?
zornet 
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The passenger-side "intake" really is an intake, not an exhaust. The fan inside is a "puller" application -- it is pulling air in, not pushing it out (electric fans can be rigged as "pullers" or as "pushers", by either changing the fan blades or changing the rotation). Hot air is exhausted out the bottom and through the rear bumper openings.
The left and right intakes are located in a moderate high-pressure area. This allows both intakes to function more efficiently.
Think about it: why would Porsche locate an intake on one side (the engine air inlet on the driver's side), and an exhaust in the exact same location on the other side? The car is longitudinally symmetric, so what happens to the air flow on one side happens the same on the other. For that matter, why would they angle an exhaust such that it would receive increasingly higher dynamic air pressure as your speed increased?
Now, going back to designing a grill to increase air intake.... You need to be careful about how you design it. If you don't pay attention to the relative direction of the airflow, you can easily end up with one that looks good but blocks air flow (remember the old VW busses? The aftermarket scoops available back in the '70s would actually cause the engines to run warmer, because the scoops actually blocked air flow. But they looked good...).