[jpinkert]

I haven't ruled out carrera calipers. There are two things I'm looking for in an upgrade:

1) Increased thermal capacity on the ROTOR
2) Stiffer caliper (the aluminum S calipers are spongy)

The carrera/boxster calipers take care of #2, but according to Bill V, don't offer much more thermal capacity. The 930 rotor is 32mm wide and seems to be the universal fix. The carrera rotor is 24mm. I believe my stock rotors are 20mm (mine are 18mm now -- time to be replaced).

I've never run out of brakes at the track. I'm just planning for future upgrades to the car as I don't want to go through this more than once. A hot 2.7 or a warmed over 3.6 is in the cards (still undecided if I want a high revving screamer or a torquey, bulletproof motor).