i just got a sn-89 supercharger

Q: How much horsepower will a supercharger give my car?
A: Paxton Automotive offers supercharging systems with factory settings from 5-8 pounds per square inch of boost pressure. This level of pressure typically results in a 35%-55% increase in horsepower. Several of Paxton's superchargers are capable of much higher boost levels by making simple changes to the pulley. Although more boost would result in additional power, it is also necessary to make adjustments to the fuel, electronics and engine modifications. Paxton does not recommend exceeding 8 psi on a stock engine.

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