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AC compressors have a clutch, thus when the AC is off - the electric clutch is disengaged and the compressor pulley is spining free (not much drag there). Removing AC all together will save you weight, but wont give you any power gain.
Installing an underdrive pulley will slow down the AC compressor as well thus it will have less drag when the AC is on (similar to Honda guys installing smaller compressors on Accords I guess)
Just my 2 cents
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1983 928 S Euro- fun to work on
2002 Boxster- fun to work on, being able to drive it is a bonus
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