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			i just replaced my old blue coolant cap, part number ending 00 with a black one, part number ending 01.  I think the part number is more important than the color of the cap.  You may want to call dealer to verify part number.  I have an 2002 base boxster.  My old cap was working fine but I replaced it as a precaution.  Cost is $17 which is cheap insurance rather than trying to hassle with it unexpectedly later.
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