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      07-14-2019, 11:34 AM   #6
kdog_x
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Drives: 14 328d
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Quote:
Originally Posted by opinion914 View Post
Always wondered what that smaller secondary hose going to the bottom of airbox was. Now that you posted a clear picture of it (pic #3) I have to ask, what is that smaller secondary hose going to the bottom of airbox? Seems redundant.
I'm not really sure what the purpose of the second hose is, never really thought about it. Maybe some type of pressure equalization. I haven't pulled the airbox apart in a while, I'd have to look at the internals of the airbox next time I have it apart for a filter change.
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