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Porsche equips the GT4 RS and Spyder RS exclusively with a 7-speed Porsche Doppelkupplung (PDK) transmission, heavily revised for shorter gearing and rapid shifts. Transferring 331 lb-ft of torque necessitates a rigid driveline. Factory rubber mounts will eventually deflect under severe launch and cornering loads. Installing stiffened polyurethane Drivetrain Bushes secures the transaxle and sharpens chassis feedback. For long-term motorsport development, upgrading clutches and flywheels ensures the PDK handles sustained track abuse without slipping.