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This CP piston is specified for the Subaru EJ257 used in WRX STI applications, with a 100mm bore, +0.5 oversize sizing and an 8.5 compression ratio. Sold as a single piston, it supports engine rebuilds that require the stated oversize dimension and compression ratio. Use this piston where the EJ257 service specs call for a +0.5 bore correction and the listed compression geometry.
CP Piston Subaru EJ257 WRX STI- Bore (100mm) - Size (+0.5) - CR (8.5) - Single
