ACT Heavy Duty Clutch Kit 04-05 Subaru Impreza WRX STi - P/N: SB4-HDR6 Product Model: ACT-SB4-HDR6 Advanced Clutch Technology Clutch kit for Subaru Impreza STI 04-05 (Complete Kit comes with heavy duty pressure plate, 6 puck race disc, release bearing, pilot bearing & alignment tool). This clutch offers 608LBS of Torque. Note: Not recommended for street use due to harsh engagement. Heavy Duty Pressure Plate * 20-50% clamp load increase * Stock to moderate pedal feel * Recommended disc: street or race 6 Pad Solid Centered Race Disc * Recommended for drag and road racing * Increased torque capacity * Fastest shifts, low inertia * Good durability but shortened spline life * Very harsh engagement, chatter