From my experience on the track, I would suggest that the base Boxster calipers are more than sufficient for track use; there is no need to upgrade to the "S" calipers.
Instead, use the money to install a more track-oriented brake pad, replace the stock brake fluid with a high temp brake fluid, and install the larger GT-3 brake ducts. Oh, and pull the brake wear sensors from the pads and tie wrap them up and out of the way to avoid melting the sensors.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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