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Mine makes a humming noise. You can hear it with the hood closed. It is not loud. Mine might be easier to hear because my hood has no insulation.
The run should be 20-25 seconds and it should restart with the car off as heat from the exhaust conducts into the turbo - if the exhaust input and output is hot enough.
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Lawrence
1986 951
2002 SLK32 AMG
1987 328GTS
2011 528i
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