The ACT HDR4 Clutch Kit is for those seeking a Pressure Plate that won't cause your left leg to grow to 2x the size of your right and a disc that is fully capable of grabbing your flywheel with ease. Calculated results are given for each clutch by publishing the increase in clamp load and estimated torque capacity in ACT's catalog and on their website. These are not mere marketing claims, but accurate estimates based from solid engineering principles, confirming what ACT already knows from the track. Each pressure plate is load tested and cycled to ensure parts meet ACT's strict quality standards.