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Old 06-30-2009, 10:43 PM   #83
Drives: 2012 GT500 SVTPP 2010 Traverse LTZ
Join Date: May 2009
Location: Roanoke,TX
Posts: 665
Most of the time, the Zl packages refer to the horsepower of the motor. See ZL500 Vette package as an example.
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