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This CP piston and ring set is specified for Subaru EJ25 WRX STI engines with a 99.75mm bore and +0.25mm oversize, delivering a compression ratio around 10:1 and sold as a set of four pistons. The set replaces OE pistons and rings to restore combustion geometry after machining and includes matched rings for correct sealing. It’s intended for rebuilds that require the stated bore and oversize specification.
CP Piston & Ring Set for Subaru EJ25 WRX STi - Bore (99.75mm) - Size (+0.25mm) - CR (10) - Set of 4
