I'm not shy about the fact that I do not like spec clutches. For the same amount of money as a spec stage 2, you could have the clutch I have, yet mine is able to be slipped and is holding up in 9 second real street cars. (my clutch is the same many of them run) I got it from Walt at Pro Motion. I always ran the FMS HD clutch before this one and I loved it, but once I stepped up to running on ET streets the clutch could no longer hold a hard launch and would slip something terrible out of the hole. The king cobra is a FMS HD with a little lighter pedal feel.. I never recommend the FMS king cobra since speaking with Don Walsh Sr. who invented it. If you want more info on this, call D&D and ask to speak with Don Sr. directly and ask him his thoughts on the FMS HD versus the king cobra, and I can almost garantee you'll opt for the HD unit. I've suggested this to people before and everyone of them have either PM or emailed me back after speaking with Don and thanking me for saving them a few bucks... the HD is a little cheaper than the King Cobra clutch.