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This CP single piston and ring assembly fits Subaru EJ257 applications with a 100.0mm bore and +0.5mm oversize, listed as a single piston/ring unit. The item supplies the piston geometry and ring package for individual cylinder replacement or custom engine builds where a single oversize piston is required, and references a 9.0 compression context in the product details.
CP Piston & Ring for Subaru EJ257 WRX STi-Bore (100.0mm)-Size (+0.5mm)-CR (9.0) *SINGLE PISTON/RING*
