[TatII]

the extreme would have a good amount more stiffer pedal and when you have a metallic disc it will have a very very narrow clutch grab point. almost to the point where its almost a on off switch. a organic clutch would have a marcel spring and a sprung hub to broaden its grab point. some ACT metalic clutches have a sprung hub but non of them have marcel springs and once it gets alittle hot from stop go traffic, it starts to chatter big time cause its trying to grab and your not letting it cause your tryin to engage the gear smoothly.