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      12-21-2012, 12:25 PM   #6
Got_Diesel
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Drives: 335d
Join Date: Dec 2012
Location: United States

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Quote:
Originally Posted by FormerRotor View Post
I believe that this acts as acoustic dampening, but it may also have something to do with the spring-loaded secondary air assembly in the box. Yes, the filter is installed with it on (it's glued on).
I heard it was for snow. to prevent snow or something. I ripped mine off, it was very dirty.
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