| but litelvis pretty much hit on the head. First of all aluminum versus steel has a different thermal properties ie. Aluminum can not take as much heat before it starts to deform and cause a possible failure. 2nd aluminum weighs less than steel and thus much less rotating inertia (less inertia more chances of bogging). Also finally the standard version of the RPS carbon clutch uses a generic pot metal for the disks versus the billet one uses better material for the components. I just checked there website and they got now a triple disk carbon billet .. Not many 300ZX putting over 1200ft/lbs of torque tho :-P
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