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Discussion Starter · #1 ·
I'm sure they're both good, but is there any proven difference. It's for a 2001 zx600 so it's not super fast, but I'll take all the little bits I can get. It will only have a k&n with stock exhaust. Dynojet said 5%, but maybe that is maximum improvement. 6 Sigma claims 2-3% increase in power.
 

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You don't jet a bike for more power. You jet a bike so that it doesn't run lean any more after modding it.

If your bike isn't running lean, you don't need to jet it. All that will do is make it run rich.
 
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