This uses the same kevlar/kevlar I believe but adds a sprung hub and is what Joe recomended for my all street driving with HKS2530 stock motor @ 16psi. It's a great clutch. I never think about it. I never hear it. It just works. Easy enough to slip a bit at launch. Easy as stock to putt around town.
Not sure how the spring weight impacts the high RPM quick shifting because I'm done with messed up transmissions and just take my time with the shift to avoid issues.
Antihero
Putting AMS garbage, and $500 ebay wheels on a Z is like dressing a Victorias Secret model in a Walmart dress and Payless shoes. You're embarrassing yourself.