Rep Power: 761

i have a 2000 ls1 z. i currently have a spec stage 2 in it. i just put it in earlier this week. but the mechanic that put it in said that he has had problems with that particular brand clutch on that car. he said that in the instructions it has a sham in it used only for corvettes. anyways he says those clutches seem to slip and go out quick. has anyone else experienced this problem with that brand clutch on this motor and car. i ordered the clutch off lmperformance.com. also does anyone know about warrenties on these clutches or lmperformance.com. thanks