
This CP piston and ring set is specified for the Subaru EJ257 engine used in WRX STI models, standard bore 99.5mm with a 9.0 compression ratio, supplied as a set of four pistons with rings. It’s intended for engine rebuilds or replacements where the EJ257 standard-size pistons are required and provides a direct application match to the dimensions and compression ratio listed.
CP Piston & Ring Set for Subaru EJ257 WRX STI - Bore (99.5mm) - Size (STD) - CR (9.0) - Set of 4