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Originally Posted by blue2000s
So do the S and non-S have the same proportioning valve PN?
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Without actually checking, I really do not know, but I suspect they do. What I do know is that we have installed several two and four wheel up grades, and none of them required the proportioning valve to be changed (the kits all came from Porsche). I have also worked on a couple of early cars that did the four wheel upgrade the hard way (swapping out the rear carriers with units from the bone yard) and neither had changed the master cylinder or proportioning valve either.
What I can tell you is that from 97-04, there are only two master cylinders for these cars: with or without stability management systems (PSM). The base and S car carry the same master cylinder....................
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