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kibble white

  1. best engine mods?

    I was wondering what are the best engine mods to increase hp. I have an 06 660 with the 686 big bore, a hot cams mud buster cam, lexx exaust with mid pipe and I'm installing a complete set of kibbble white valves and springs this week. I have the dynatek cdi and the carb has been re-jetted...