I have the OS Giken TR twin disk. You don't need a clutch fork, you have to get an adapter that slides over the csc like jshvr said. I also got the RJM pedal to help make it a little easier to drive. Haven't driven with it yet, still finishing up on the turbo kit, and engine internals. But it was recommended to me by a few different people, including zspeed. I wouldn't go for the southbend stage 4, I think it would be even harder to drive than a twin disk, and the pedal will be very hard. I think a twin disc would be the far better choice.
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2013 370z Nismo Turbo
2017 Lexus IS200T F Sport (DD)
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