This is likely because the plastic valves typically found in OEM setups would not be capable of handling the A45's 26PSI of boost without failing prematurely

2 BAR: TS-0625-1032

Solid aluminium bushing for the BMW e36 and BMW e46 rear trailing arm

3mm x 80mm M6 Clevis

Clutch Kit - Xtreme Performance Heavy Duty Cushioned Ceramic 270Nm KNI18001-1C SL-01 This is likely because theXtreme Performance Cushioned Ceramic kit 1C Recommended for: Motorsport ApplicationsThese kits are available with cushioned 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 270Nm Clamp load Increased over standard Cushioned Ceramic Friction Disc Heavy Duty Pressure Plate Kit contains everything you