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The JE forged piston kit for Subaru EJ‑series STI applications is a four‑cylinder set sized to a 3.937 in. bore with a 9.50:1 compression ratio and an inverted dome/dish profile. JE forges and machines these pistons in the USA and provides complete kits including JE Pro Seal rings, wrist pins and locks. The Forged Side Relief design reduces skirt width and friction, while accumulator grooves and skirt coating options support consistent ring sealing and longevity.
JE Pistons SUB STI EJ257 100mm Bore CR 9.5 KIT Set of 4 Pistons
