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CP Pistons piston-and-ring set for the Subaru EJ257 WRX STI provides a single replacement piston sized for a 99.5mm bore at standard (STD) size and a 9.0 compression ratio. Intended as a direct replacement component, it pairs the piston with matching rings to restore sealing and compression during engine rebuilds or repairs where an EJ257 piston is required.
CP Piston & Ring Set for Subaru EJ257 WRX STI - Bore 99.5mm - Size STD - CR 9.0 - Single Piston
