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Manley Extreme Duty Pistons for the 2009-2017 Nissan GT-R R35 with the VR38DETT engine 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 100.0mm bore with 9.3:1 compression ratio is best suited for sleeved blocks in bored for medium to high boost turbocharged applications. Extreme Duty pistons come standard with .210" wall 9310 wrist pins.