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This CP Piston and ring set is specified for the Subaru EJ257 (WRX STI) with a 99.5mm bore at standard size and a compression ratio of 8.2. Supplied as a matched piston and ring package, it serves as a direct replacement during engine rebuilds where correct bore dimension and compression ratio are required to restore or maintain the engine’s intended specifications.
CP Piston & Ring Set for Subaru EJ257 WRX STi - Bore (99.5mm) - Size (Standard) - CR (8.2)
