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It could be the supercharger snout itselft. I just replaced mine because it was making a sort of knocking noise. I started out just hearing it at start up and turning it off. Mine runs like a champ now along with a smaller pulley and an exhaust job.

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Q: What does it mean when the supercharger pulley on a 1998 Prand Prix GTP is making noise upon idling or when turning engine off?
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