Chris, yes, the usual Boxster "upgrade" is mostly bling, the calipers are great and quite light, but the Carrera rotors don't bring much to the table. In addition about the same performance can be obtained from using a stock Carrera front caliper and rotor.
The nice thing about Pete's kit is he does increase the rotor mass and potential brake torque w/o imposing too much of a weight penalty. The heavier rotor is compensated for by the lighter caliper. This path is similar the one that Hayden took on his wonderful Wevo brakes
The weight penalty thing is often overemphasized any way. If you are running out of brake half way through a session you need more brake, period.
Yes, you need to try all the other things like cooling, pads and fluid first, but bottom line is, if you need em you need em.
It's great that the gifted drivers out there don't.
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