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      01-15-2014, 06:34 PM   #25
First Lieutenant
Drives: 2013 BMW 135i Msport
Join Date: May 2013
Location: Minneapolis, MN

Posts: 331
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Sounds identical to this guys issue:

The only part I did not install was the downpipe...could the down pipe be loose or have a bad gasket and great this noise?
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