Ok, I really don't see many threads on clutches for 400+hp...I have had the worst luck tring to find a good one for drag racing/street.

I will post my trials, please post about only the ones you have tried.

My first cluctch was the centerforce df. That thing rocked-felt like stock but ,gave up on the top end of a hybrid- 300rwhp ish.

Next was the RPS extream PP, sprung 6 puck, rated for 550hp it was a pita to drive but, held up to about 425-450rwph.

Now I have a used twin disc OS Giken witch, as far as I can gather from one site it should hold 600hp but, I'm having a hard time making it hold any more than the RPS. It does only have 150 miles and is used so I'm giving it some lattitude and hoping for better. The upside is that it is much easier to engage and shifts faster...makes driving fun again. I may have to find a tripple....

I'd really like to hear about Exedy's twin.
The other option is the ACT extream pp but, as everyone has said-it will bend forks and eat hydrolics and is the biggest pita to drive.

 

Update: 50 more miles of high gear slips and she is now holding much better(OS Giken) .

 

Os Giken twin holds a good launch or the gear shifts but not both past 18-19psi.

time. Guess I'll have to look at my driving style or something.