At California Speedway and the Streets @ Willow Springs I didn't experiance any brake fade. I'm running the Carbotech XP8 pads in the stock calipers up front, and the 917 shoes out back. I changed the fluid to ATE Superblue DOT 4. I also upgraded to slotted rotors.
These two track outings were on 500TW tires and stock suspension, and the brakes were more than up to the task of cooking off the tires after about three laps at both tracks (it's a pretty wierd feeling when the front tires start squirming around under the car while threshold braking, and getting so hot and gooey that they don't make a sound while 4-wheel drifting on corner exits

)
I have a set of Rota's wrapped in RT-615's for the next track day, so we'll see how things hold up....
The tires will work the brakes a lot more, but I don't think things will get to heavy for the stock brakes.
If anyone is interested, Garm at
www.microimageonline.com is the guy to go to for the Carbotech pads and shoes.