these kits have many different sized jets to suit what i need? .. which stage (1, 2, 3) is a good kit?

 

It comes with a different needle and like 15 different mains. If your talking about the stages for the jet kit it recommends what stage to use depending on your mods. Stage one is for just a filter , stage 3 is for filter and pipe, there is no stage two.

RoughRider01

 

The Stages are for what typ of set up you have like pipe filter altitude ect