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      10-06-2012, 04:33 PM   #10
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Drives: E92 M3
Join Date: Oct 2010
Location: New Jersey

Posts: 229
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My e36 M3 used to do that with a cold air intake, which amplifies the noise. It's the air being released from the intake a second after engine is shut down. It's a quick hiss so if your describing a hissing sound that lasts for awhile than its not that. Could be a snake in your car.
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