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This CP forged piston and ring set is specified for Subaru EJ257 WRX STI engines with a 100.0mm bore, +0.5mm oversize, and a listed compression ratio of 10.0; supplied as a set of four. The set provides matching pistons and rings for cylinder oversize work and is intended for engine rebuilds requiring +0.5mm sizing in the EJ257 four-cylinder application.
CP Piston & Ring Set for Subaru EJ257 WRX STI- Bore (100.0mm)-Size (+0.5mm)- CR (10.0) - Set of 4
