what power are you after?
they arent a high hp clutch,i dont care what they say.
id forget it if you have over 200rwkw.
look at the springs in the centre,they allow the clutch to "slip" in reference to the spline.
if you have any sort of power the springs spend most of their time fully compressed and lose their spring rate.a heavier sprung clutch will have 1 spring, 1 rubber all the way around.
the rubber adds stabilty to the sprung centre.
as changing clutches isnt most peoples idea of a good time i seriously recommend getting a really good one that will support lots more than the power you currently have.
dont end up like i did pulling my brand new "performance" clutch out only to find its absolutely rooted and i just wasted $600