Thread: hood air duct
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      09-28-2011, 03:04 AM   #20
JIO
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Drives: '09 Space Gray E92 M3 w/DCT
Join Date: Aug 2005
Location: Eugene, Oregon

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If water enters into the airbox through the hood, it will just run right out and come out down at the lower air intake. Just open up the airbox and you'll see that it tough for water to get sucked into the air intake through the air filter. There is nothing to worry about.

Now of course if you plug the bottom hole, it'll be like closing the drain plug on your bathtub...it'll eventually fill the airbox, suck water into the intake, and destroy your engine. Water unfortunately doesn't compress as well as air.