I've just bought a new to me 996tt. The brakes do work and stop the car from interesting speeds.
I do feel they're lacking in bite and require a lot more force to stop.
I took the car to a local specialist for a much needed service which turned into 4k USD of work and parts
I don't have a huge amount of time to do the spannering myself these days, but I am keen to improve the brakes.
Looking around the www, it seems 996.2 GT3 calipers seem to be a popular upgrade, which allows the use of 997 turbo rotors, so going from 330 to 350mm. These were a reasonable price back in 2012, but Porsche have seen fit to jack the price up significantly.
btw, my rotors are fine, no corrosion on either side, fluid is fresh and pads have plenty of material, although I'm not sure what make / type they are.
What about alternatives ? Cayenne (Toureg, Q7) calipers work in this application ?
If they stop a >2tonne SUV, they'll stop my 6t jut fine I reckon.