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Flowmaster exhaust on 01' GMC Sierra

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Old 07-13-2012, 04:06 PM
  #11  
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im running this one here:
MagnaFlow 11379 - MagnaFlow Performance Mufflers - Overview - SummitRacing.com
deleted the cats and had em tuned out by Futral, sounds real rowdy and loud as **** but cruising at 70mph isnt too bad in the cab.
Old 07-16-2012, 04:16 PM
  #12  
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I've had Flowmaster,Borla,dynomax,& now magnaflow. Like magnaflow the best. It's 14" case 3" si/so.
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