I guess I will be the anti SPEC person, with a SPEC stg2 on my 1991 347 with a 150 shot burned the hell out of it, SPEC replaced it on warranty, thats fine...now a couple of months down the road after I put the new one on new flywheel and throwout bearing readjusted the cable and the pivot ball as per SPEC specifications and with about 500 miles on it and started to beat on it, I threw the juice on it and I disintegrated it, literally... broke the the fibers off the clutch disk, threw rivets around all in my bellhousing, manufacturers defect is what they said, nevertheless, they replaced it again, after I got the new disk, I sold it on ebay with the pressure plate and then went with the centerforce. Surprisingly, I did not have aproblem with it back then squeezing it on the bottle. No problems, no worries, this was well over five years ago, to this day that clutch kit is still in action and having no issues. So some people have had problems with them, I have not, this is a big ongoing issue on the corral, and it seems like it is about 25-25-25-25 between the users of RAM, SPEC, Centerforce, and the good ole King Cobra. Now the shit from what I hear is the King Cobra disk with a Centerforce DF pressure plate is supposed to be TITS, there is a guy on another board StreetCarForums.com, running that same combo, and is blasting away at low 9's on that setup.