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      10-18-2009, 07:23 PM   #58
MysticBlue
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Drives: '20 M5C, '09 M3 DCT Coupe
Join Date: Apr 2008
Location: Eastern Oregon... They call 'em rigs here

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I don't think the hood vent is a high pressure area, at least relative to the air box. At highway speeds after washing or in the rain I see water droplets blowing up/out of that vent. I think the main purpose is to keep cool air flowing through the air box even when you are at partial or zero throttle so when you first go WOT, the engine isn't getting a slug of hot air.
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