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Old 09-10-2011, 03:28 AM   #6
yzrider58
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Drives: 10 1SS, 09 Acadia, 90 K1500 Z-71
Join Date: Aug 2010
Location: Tucson, AZ
Posts: 831
The finance guy at the dealer we bought our 2010 from had it installed on his SS. He said it was barely louder than stock. It probably did add horsepower, but didn't sound like it should for the price.
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