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The kit is a set of cams and the airbox they used on the 1999 models, plus a re-program for the computer (which you won’t need).
The cams performance is somewhere between stock and an aftermarket cam. Better than stock, not as good as an aftermarket cam.
The bike will absolutely, positively, 100% need to be custom tuned on a dyno with a Power Commander. This fact will make or break your decision. If you have the ability to dial in the combination with a dyno and PC then, yes, it’s a great buy. If you don’t have the ability, then keep on walking.