Anyone have an idea what a subtle vacuum sound could be when the supercharger kicks in? It is not super loud.

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It might help us if we knew more about the car and aftermarket items.

 

No aftermarket items. Husband just replaced clutch. That's it. He probably jacked something up! Hahaha

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Mine makes that sound when the bypass valve isn't all the way shut when I'm on the gas about 3/4 throttle. If it's running fine...I wouldn't worry about it

Unless less you never noticed the noise before the clutch install....then there would be a leak somewhere.