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Action Clutch Stage 3 (1MS) for 2004–2021 Subaru WRX STI (2.5L EJ257) uses a sprung MIBA Ceramic disc, reinforced drive straps, and a heavy-duty diaphragm plate to provide quicker engagement and enhanced durability. It suits more demanding street and occasional racing conditions where faster clutch response and greater holding capacity are needed, with some expected clutch chatter during break-in.
Action Clutch 04-21 Subaru WRX STI 2.5L (EJ257) Turbo AWD Stage 3 Clutch Kit (1MS)
