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Old 08-21-2012, 11:21 PM   #10
RoketRdr
 
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Drives: 2010 Duramax; 2012 CTS-V Coupe
Join Date: Apr 2012
Location: Houston, Tx
Posts: 387
What you're hearing is the flappers vibrating in the exhaust tips. The Vette's do it as well. A light spring can cure this issue.
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