not always, maybe the centrifugal ones, but the roots style Stillen that I had on my 350Z had a vacuum operated bypass valve that relieved the pressure on the compressor when not on the gas hard.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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