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CP piston and ring set for the Subaru EJ257 WRX STI is supplied as a set of four with a 99.75 mm bore, +0.25 mm oversize and 8.5:1 compression ratio. This set is intended for engine rebuilds where the listed oversize and compression specifications match the EJ257 application. Included are pistons and rings sized to the stated bore and compression details for accurate replacement fitment.
CP Piston & Ring Set for Subaru EJ257 WRX STI- Bore (99.75mm) - Size (+0.25) - CR (8.5) - Set of 4
