All the metal components on F8X rear suspension are from high strenght steel

Proprietary high-temp silicon Nomex diaphragm

OEM brake disc can not be used

but then the factory-designed kinematics won’t work as they are supposed to

Clutch Kit - Xtreme Performance Heavy Duty Organic Incl Flywheel 600Nm KSU24588-1A JRX3 All the metal components onXtreme Performance sprung organic kit 1A Recommended for: Street use in vehicles with minor engine modifications. Sprung organic clutch kits offer exceptional driveability for vehicles used daily but also have performance modifications. The sprung organic disc offers improved dampening which reduces the shock loading on the transmission. Specifications: Torque capacity 600Nm Clamp load Increased over standard Organic Friction Discs Heavy Duty Pressure