Plastic OEM blow-off valves like those on the RS have a track record of failures - they leak

Brown/Blue 10psi Outer Spring (installed)

throughout the RPM range

embodying the performance

Clutch Kit - Xtreme Performance Heavy Duty Organic 450Nm KMZ24040-1A JR33 Plastic OEM blow-off valves likeXtreme 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 450Nm Clamp load Increased over standard Organic Friction Discs Heavy Duty Pressure