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  1. #1 Mufflers 
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    Purchased an 08 Grand Prix GXP picking it up Saturday the first mods are going to be is the trans cooler and shift kit and I'm looking for mufflers I just don't know what a good brand of muffler is for the gxp with minimal drone and is the pipe diameter 2.5''
    Last edited by gordster1122; 07-14-2016 at 10:43 PM.
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