This is a frequent topic with lots of prior info so a search through the site may be useful to bring you up to speed.
FWIW all the Boxster Spec race cars are on stock base calipers so you don't need to go to "S" brakes to track your car but many want "S" brakes anyways. Bottom line: "S" Brakes have more heat soak capability but not shorter stopping distance. Stopping distance is mostly a function of weight and tire grip.
Good luck in your search.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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