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Old 05-21-2010, 05:59 AM   #25
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Join Date: Dec 2009
Location: Florida
Posts: 2,267
My Ride: ///M3 Vert
I did notice on the stock airbox there is a spring loaded valve kind of thing, it's a 2 inch wide circle of plastic with a spring behind it, and you can push it into the airbox, is this for when you don't have enough airflow?

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