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OP, changing your crank pulley is not going to make an appreciable difference. Some people might disagree, but when we're talking forced induction, any sort of gain to be had from changing the crank pulley is completely insignificant to what can be gained by changing your supercharger pulley.
By decreasing the diameter of the supercharger pulley, and making sure that your tune is either compatible or updated is going to increase the amount of boost the supercharger will create. More boost can equal a lot more power, if it's tuned correctly of course.
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