don't quote me on this, but i believe that it has to do with how much power they can handle/what you want to do. the stage 1 is for just normal driving, n/a(no turbo, supercharger, things of that nature). the stage 3 is for turbo'ed apps, street/strip work, stuff like that. a lot of people that i talked to said to go with the stage 3 anyhow, that it's not too agressive to drive everyday, and if you plan on doing anything down the road, you'll really kick yourself. also, if you're doing the clutch, you might want to look into a fidanza flywheel as well. just a thought. good luck, later
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