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CP Pistons piston and ring set for the Subaru EJ257 WRX STI is a four‑piston set sized to a 100.0mm bore with +0.50mm oversize and a listed compression ratio of 9.0. Supplied as a complete set, it is intended for engine rebuilds that require the larger bore size and matched ring clearances to restore proper sealing and compression following machining or wear.
CP Piston & Ring Set for Subaru EJ257 WRX STI- Bore (100.0mm)-Size (+0.5mm)- CR (9.0) - Set of 4
