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Old 06-27-2011, 12:38 PM   #10
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Join Date: Jul 2010
Location: NY
Posts: 316
My Ride: e30, 2004 zhp
It has the stock airbox, the a/c is already off, and it occurs probably about 5-10 seconds after the engine shuts off. You can hear an electrical motor running, like a HVAC vent is electronically closing and when that stops, you hear the air release.
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