By swapping out the pulleys . A smaller pulley on the supercharger will make it spin faster. This will make more boost. And vise versa. Also the drive pulleys can be swapped.
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Are you talking about the tuner kit option? Because neither option on that link is legal in California.https://www.procharger.com/truck-superchargers/general-motors/gm-trucksuv/2000-1996-gm-truck-suv
Here's a link. For the 2 kits