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Yes, it's true. We just had the supercharger replaced on our '09 CTS-V.
In our case, the noise happened at light acceleration at lower rpms. Sounds like spark knock, but isn't. After they replaced the blower, the noise went away.
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2002 Z06 "Blue Meanie" 11.36 ET
2003 Z06 in progress
2009 CTS-V "Spooky" 12.36 ET, bone stock at 1600 mi. Rainy day in Sacramento. Sadness.
2010 ZR1 "Satan" no times yet.
2013 Volt SCCA Solo2 #771 HS3.
And a bunch of Duramaxes.
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