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the cayenne brakes are huge and heavy, designed to stop a VERY large vehicle.
the S brakes are a HUGE upgrade to the boxster; no comparison on the track. i had many problems with the standard brakes & never really had confidence in the system. the S brakes + GT3 brake ducts bought + race pads bought me almost two seconds a lap & instill a lot of confidence by comparison.
IMO, you will see a net performance DECREASE w/ cayenne brakes due to increased unsprung mass. i bet you'll get better stopping distance w/ the S brakes.
after a point, it all comes down to tires anyway......
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