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      04-27-2012, 05:05 PM   #6
micknugget
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Drives: 2012 F30 328 Red
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Location: Detroit

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I would think that the mechanical sounds would have to do with various pressure reliefs. With a twin scroll turbo, direct injection, high pressure fuel pump, etc. I would think that after the engine is off a little while that the various pressures would be released to protect the component.
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