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Many of the old compressors were a piston style. They were like a one cylinder engine and rather rattling things.
Newer ones are scroll compressors and quieter and more efficient.
Unless you are going for a 100 point show car, you will like the newer compressor.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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