It has only cover function

Features sequential ports for quiet operation on mild boost and full performance at full boost

for those who wish to avoid the cost of an aftermarket turbocharger

\n Optional Position Sensor Available Separately

Clutch Kit - Xtreme Performance Heavy Duty Sprung Ceramic 600kg (45% inc.) KMI22003-1B JR16 It has only cover functionXtreme Performance sprung ceramic kit 1B Recommended for: Motorsport ApplicationsThese kits are available with sprung ceramic friction discs and are designed for motorsport applications where higher heat and torque capacity is required. These can also be used in some road applications. Specifications: Torque capacity Nm Clamp load 600kg 45% Increased over standard Sprung Ceramic Friction Disc Heavy Duty Pressure Plate Kit contains everything you need