best one i've seen is ACT.. it hold all the power u can think of.. i've had the centerforce slip under boost.. so if you want something to hold lots of power get the ACT.. stillens is just a centerforce, which is rebadged in stillens usual quality
stillen can get the flywheel and there are a number of clutches to get,act,centerforce,clutchmasters,jwt,and some others.
