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Polk is right, the smaller pulleys allow the supercharger pulley to spin faster. You could switch out the pulley on the charger too, there are a lot of options. I just opt'd to do it this way because of saving some money and room for even more expansion...
Just to clarify.....a smallerpulley in anyspot other thanon the supercharger will work against you asfor as making boost. Other than changing out the supercharger pulley with a smaller one, putting a larger pulley on the crank is a common option to make moreboostas well (since every RPMwill spin the supercharger faster with a larger crank pulley).