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CP Piston and ring set specified for the Subaru EJ257 used in WRX STI applications, sized to a 99.75mm bore with +0.25mm oversize and a 9.0:1 compression ratio. This matched piston-and-ring package is offered for rebuilds or bore-up work where those exact bore and compression specifications are required for EJ257-powered builds.
CP Piston & Ring Set for Subaru EJ257 WRX STi - Bore (99.75mm) - Size (+0.25mm) - CR (9.0)
