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      12-21-2012, 03:31 PM   #7
F104
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Belgium
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Drives: E92 320D M-sport
Join Date: Apr 2008
Location: belgium

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it's simply a first level foam filter to prevent the larger pieces of sand, leaves, insects etc go into, and block the folds of the paper element. Open the airbox, most of the stuff you find lying on the bottom was kept out by the foam