a 2002 zx6r is carburated (sp?)...a powercommander is used to help tune fi (fuel injected) bikes...kawi didnt use fuel injection on the ninjas till 03 i believe... if you have changed the exhaust system and/or air filter and etc...on ur bike then you use a jet kit, dynojet, kawi, plenty of companies make them...as far as i know they just adjust the air to fuel ratio in the carbs to make the bike run better...just like the power commander would adjust on an fi bike....just go to a shop and ask a professional or get online and look for carb jet kits, for your specifications