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uscgsierra5.3

01-29-2012 09:56 AM

2006 gmc sierra performance?

Hey guys I'm new to the site. I have a 2006 gmc sierra 5.3 with 3.42 gears. What can I get to gain quick hp and 1/4 mile times? I have already put on a spectre cold air intake, and a flowmast outlaw super 44 exhaust.

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