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This CP Piston and ring set is made for the Subaru EJ257 engine used in WRX STI applications and is specified at a 100.00 mm bore with a 0.50 mm oversize. The set reflects an 8.2 compression ratio specified in the source and supplies pistons and rings intended to match those dimensional and compression specifications for engine rebuilds or upgrades where EJ257 dimensions are required.
CP Piston & Ring Set for Subaru EJ257 WRX STi - Bore (100mm) - Size (0.5mm) - CR (8.2)
