Manley Size STD Stroke 79mm Bore (99.50mm Grade A) SINGLE Piston w/ Rings WRX STI EJ257 2004-2021

Part #: 612000CA-1. Manley Subaru pistons crafted from high-strength 2618 material offer easy DROP-IN installation. They match OEM Grade Range A or B bore sizes. Just pick the right grade for your engine block, as each grade has the proper clearance built - in. These pistons come with Premium Chrome Moly 0.180' wall pins, great for moderate boost. Included are Total Seal piston rings. The top ring is AP steel, and the second is a Napier profile for better oil control. For high - boost engines, we highly recommend installing 9310 alloy 0.210' wall wrist pins (part no. 42546).

Using these Manley pistons is straightforward. First, make sure to select the appropriate grade range of pistons for your engine block. This ensures a proper fit with the pre - designed clearance. When installing, the DROP - IN feature makes the process easy. The pistons come with Premium Chrome Moly 0.180' wall pins suitable for moderate boost. But if you have a high - boost engine, replace these with the recommended 9310 alloy 0.210' wall wrist pins (part no. 42546). For maintenance, regularly check the Total Seal piston rings. The top AP steel ring and the Napier - profile second ring help with oil control. If you notice any signs of wear or reduced performance, it might be time to replace the rings. Keep your engine well - maintained to ensure the pistons last a long time.