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  1. Help Please!!!!!!!

    Performance and Tech
    i have a 2007 zx10r and i just got the competition werkes gp race exhaust. Im trying to decide whether or not to gut the cats or just install the slipon. I dont have a pc3 yet and probably wont get one till around april. How bad will the bike run with out a pc3 or a tune? and is it worth gutting...
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