Exedy 2004-2011 Subaru WRX STI H4 Stage 2 Cerametallic 4 Puck Disc Fits 15951HDP4EXEDY cerametallic clutches are designed to handle the abuse of high power modified engines. Our cerametallic friction material can handle much more abuse than stock type disc assemblies without slipping and fading. All EXEDY Stage 2 cerametallic clutch discs have sprung center dampers to reduce the impact and shock loads transmitted through the drivetrain. We offer two types of cerametallic discs, "thick" and "thin" along with a cushion button disc.