Alright a friend of mine's has a 99 rs-t and he threw a a SBC Modular TZ series (stage 2). Anyways he was driving one day and it started slipping (note clutch has like 10k on it so far). Next day it was done, and his guess was either it was a defective clutch or he was running it hard. Due to heat we all know it should slip once in a while right???