Do you have any mods? If you don't have anything beyond a couple of bolt ons I'd really recommend staying with the OEM clutch. I know it's boring, but it's also butter smooth. Nothing sucks worse than a chattering aftermarket clutch that'll hold 600 ft-lbs of torque, but is crap for everyday driving.
I just replaced the clutch in my Mach with an OEM...I did think about going with a high dollar Centerforce so when I do (if I do) go with a SC I'll be set. At this point I value my everyday driving experience and don't have a whole lot of hope for that KB or
Whipple in the near future.
The new OEM clutch is just awesome. Feels brand new, as it should. Couldn't be happier.