They're also simply not designed to handle increased boost levels

it increases oil pressure at higher boost levels

and 38mm weld flange

which connects to the vehicle's MAP sensor to obtain a reliable manifold pressure reference

Clutch Kit - Xtreme Performance Race Sprung Ceramic Incl Flywheel & CSC 910Nm KVW24695-1R JR21 They're also simply not designedXtreme Performance Extra Heavy Duty Sprung Ceramic 1R Recommended for: Motorsport Applications 1R kits feature a sprung ceramic friction disc, but with even greater clamping force pressure plate for higher torque capacity. These kits are designed specifically for motorsport applications such as circuit, rally, drifting and drag racing. Specifications: Torque capacity 910Nm Clamp load Increased over standard Sprung Ceramic Friction Disc Extra Heavy