from what i just posted in a similer post
ok check this out i bought myself a H/D Cushion Button excedy clutch about 3 years ago for my drift cat
i go to minimum 9 events a year
so a ruff total of 27
pulled out motor/ tranny last week to do some work
i pulled out the clutch and measured the meat left on it
i emailed excedy and asked what was on them brand new
turns out i have %90 Left on there
so i blew a gear box did 27 drift days
a massive amount of clutch kicks and the good old single plate button has lived
Btw my specs are im running 320 rwkw's out of a rb25 with close to 600nm of torque