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Tlook,
The biggest advantage of bigger brakes is the increased thermal capacity of the bigger rotors. An SC uses 282x20 front rotors, a 3.2 carrera uses 282x24, a 930 uses 304x32, a 3.6 turbo uses 322x32. So first decide what rotor you want/need. I used the 304x32 for a 2400lb Carrera with a 3.6 they work great. George K used 282x24 in his 2400lb Carrera. The 304x32 is a 2 piece unit using a flat hat to bolt to your stock hub. If you want to use the 282x24 rotor you can probably save a lot of time and $ by just buying one of the Boxster monobloc conversions which are set up for the 282x24 rotors, I know Performance Products has them, Pelican also has them (http://www.pelicanparts.com/catalog/shopcart/MISC/POR_MISC_brembo_main.htm)I think there may be a mistake on their page though 12.7" sounds way to big for the rotor, 11.7" is more like it. I would make sure to do both ends of the car at the same time. The 304 or 322x32 has nuch more thermal capacity but it is also much heavier and much more expensive, and requires bigger rims, they are really only needed on heavier, faster cars. In addition the bigger rotors will require machining the calipers to change them from transverse mount to radial mount. You can use the 944T or 964 calipers or MO30(bigred), again I used 36/44 pistons front which balances nicely with the 30/34 rear. In the back the rotors /calipers need to balance the front setup. I used the 299x28 mm 1 piece 930 rotor, it is a direct bolt on and lets you use your parking brake, the calipers only need a minor repoitioning of the transverse mounting holes to work.
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