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knocking sound

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Old 08-19-2011, 07:31 PM
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my friend started up his truck today and took this video to show u guys.. its an 09 sierra with LT's and cai and tune.. nothing else

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Old 08-29-2011, 12:10 AM
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Old 08-30-2011, 02:50 PM
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hows it run? post a vid revving it a little. collapsed lifter maybe...
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