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      03-18-2012, 01:43 PM   #5
First Lieutenant
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Drives: 335i
Join Date: Nov 2011
Location: USA

Posts: 313
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This is interesting.

But I don't trust the factory rubber seal on the stock air box. They look cheap and will become loose very fast under heat. Which means it may will have a leak, if it leaks. Dust will go into the engine.

Maybe not that bad, but personally, I like to remove the air box.
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