we used to use the 6 puck type...

however, our biggest problem over the years has been keeping the transmissions intact...
in fact, for our three RX7s we have in stock six additional transmissions,
three in rebuild, and three ready for use... if you remember one NHMS race weekend
last year I broke the tranny in the 14 car on the first lap of qualifying, trailered
home, swapped another tranny in in 1.5hrs, and returned to win the race after starting
from the back

what does this have to do with clutches you ask? well, we found that downgrading the clutch
from a six puck racing clutch to a "stage 1" exedy street performance clutch greatly
reduced the incidence of transmission failure ... our measly 175hp isn't what the
racing clutches were created for... the street performance ones work just fine, and they put
less shock load into the tranny ... here is the exedy page:

http://www.exedyusa.com/race_clutch/...e_1_clutch.php

best!
Glenn