The street Disc's are all made of organic material and are not made to launch the car. The Street disc's will hold power fine once engaged, But will glaze trying to get a 3500 lb car moving an engine speed of over 3000 rpm quickly.
The Material RPS has been useing for the last year in their 6 puck disc in extremely smooth and has almost no chatter, Also the RPS 6 puck has a sprung hub so it absorbs the shock like a steet disc. The RPS 6 puck is the only choice IMO for someone that aggressively drives a Z and want to lauch it hard once in awhile. This Disc will not hurt your trans.