Did you know?6.0 L 'VortecMAX' V8 with VVT and Active Fuel Management, 366 hp (265 kW) (late 2006).
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OldVMer just had the same issue with his 09, They changed out the deck and it isn't as loud as the original one was. I think Intimidator also mentioned something about his doing it.BTW
OldVMer has an 09? When did that occur? Wow~~
I have that noise in my '10 LTZ as well