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I have been looking into this some more and here is what I now think. Altering the way the air flows on these vehicle should be done with some caution and here is why I think so. Air is coming in through your upper and lower grilles, this air flow is pretty much directed to pass through your condenser and radiator to allow for maximum cooling, while the car is standing idle, the fans draw the air through the components as cooling does not happen without air movement, in addition while your car is in motion I believe that air is not drawn into your engine compartment from underneath I think pehaps the opposite, the movement of air under your car most likely has a venturi effect and draws hot air out and allows for maximum air flow. The scoop and snorkel allows the engine to draw fresh air. If the snorkel wasn't there you would be working against yourself. The air in your engine compartment has been heated by passing through your radiator pulling it's heat with it. This is the hottest air in your engine area, quite the opposite of what a CAI is "supposed to do". By adding scoops or deflectors to help draw air toward the intake will help in this area but will also take some air flow away from the radiator and may interupt the way the air flows causing higher temperatures, again in theory undisireable. So the most realistic solution is to add a vent to supply air to the engine compartment and gettng it there without taking away from the air flow design GM has engineered, I am sure that their extensive use of wind tunnels and CAD has this working quite efficiently.As mentioned there are hood designs which will eliminate the problem but I am looking at another method myself.
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