An increase in displacement is the ultimate way to gain horsepower and torque. TR Premium Stroker Kit offers an increase in bore and stroke to achieve this goal using your original EJ seriesblock. TR Stroker Kit for Subaru EJ20 engine is built with the quality features and the latest technology in coating options to ensure the dependability that comes from every TR products. TR uses competition grade components from forged 2618 aluminum pistons, forged 4340 rods, and Billet crankshaft chosen specifically to offer the durability to handle high horsepower demands. Coupled with competition series bearings, TR Stroker Kit is the ultimate option in Subaru engine upgrades!