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Action Clutch Stage 4 (1MD) for 2004–2021 Subaru WRX STI (2.5L EJ257) pairs an unsprung MIBA Ceramic disc with a heavy-duty diaphragm plate and reinforced drive straps for aggressive engagement and race-capable durability. The kit is targeted at dedicated track use and delivers quicker response at the expense of a more abrupt engagement feel compared with street-focused kits.
Action Clutch 04-21 Subaru WRX STI 2.5L (EJ257) Turbo AWD Stage 4 Clutch Kit (1MD)
