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Manley Plainum Series Pistons for the 1998-2016 Subaru 2.2 liter, DOHC EJ205/EJ207 motor with 79mm stroke crankshaft are designed to withstand the high stress and pressures of racing applications. The pistons are machined from high strength 2618 forgings. Each design is lightweight yet robust enough to deliver long service life. Perfect ring groove to skirt squareness is achieved through Manley's unique "one fixturing" manufacturing method that assures maximum horsepower. Round wire locks, tool steel wrist pins, and rings are included with every set at no additional charge. The 92.5mm bore with 8.5:1 compression ratio is best suited for blocks that need to be rebored and are to be used for medium to high boost turbocharged applications.