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The Manley Platinum Series piston for the Subaru WRX STI (EJ257) is a single 99.75mm +0.25mm bore piston with a 9.8:1 compression ratio, built from 2618 alloy forgings. The Platinum Series features proven cam and barrel skirt profiles, tool-steel wrist pins, and moly skirt coatings on select SKUs, delivering the precision and material quality used by professional engine builders.
Manley Subaru WRX STi (EJ257) 99.75mm +0.25mm Bore 9.8:1 CR T/T Platinum Series Piston - Single
