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Originally Posted by arenared
For the original poster, I would not do the fronts without the rears as you will be increasing the already heavy front brake bias and decrease your braking capability although you would be increasing the heat soak capabilities of the front. I would recommend trying more aggressive pads, and if that is not enough (your pads/rotors overheating), then the S brakes would be the next logical step. The special Brembo rotors that 'insite' mentions and I've been looking for are the missing link. BTW, you can sell your calipers and recoup the majority of the costs of S calipers because Boxster brakes are in very high demand by VW/Audi modders.
I also put in braided stainless lines. No detectable difference IMHO. Flushing the fluid is a good idea if you haven't done it recently/regularly.
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actually, the more one increases the braking capability of the front, the less of a need there is for rear brakes. this happens because the car dives under braking, transferring weight to the front of the car. in an extreme example, the rear wheels would lift off the ground (endo) and 100% of the braking would be done by the fronts. this is of course limited by tire traction.
regardless, the caliper pistons, rotor diameter, and proportioning valve are all the same as on the S. the only difference is rotor thickness / offset. doing the fronts without the rears creates no problem; the system will brake better than the base system.
as for those rotors, do a search at boxster racing board. someone posted the name of the place that sells these. i can't remember off hand.