If you have a manual transmission, then you also a have a freewheel type alternator pulley. It will make some noise as the engine idle speed changes. Mine was making a lot of clicking, and made a screaming noise as it coasted after revving the engine. Replacing it solved the problem.
-james
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'01 Boxster S, 51k miles
'05 Mazda 6 Grand Touring Wagon
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