Spec stage 4

anyone have one?? it has the same torque capasity as the stage 3 and is 20$ or so more..

what is different about it?

EPP says

Spec SC094GTO - 04-05 GTO Spec Clutch - Stage 4
For those who practice a lot of holeshots!
Price: $439.99

i believe that the main diff (atleast in the fbod world prolly the same with the gtos) is that the stage 4 has an unsprung friction plate hub which is also why the market it as race only but from what ive heard and personal experiance with the stage 3 if i were to buy a new clutch it would be the stage four the driveability is almost exatly the same as the three and no worries about killing the friction disk with to much power