Manley 99.5mm STD Bore, 9.8 Comp. Pistons Subaru WRX 2006-2014 / STI 2004-2021

Part #: 612100C - 4. Manley's forged and dished pistons for the EJ257 are crafted from high - strength 2618 material. They're lightweight yet tough, offering a long service life. Each set comes with round wire locks, tool steel wrist pins, and piston rings at no extra cost. A special multi - step top ring groove machining process ensures perfect control of the groove's size, shape, flatness, and finish. Precise pinhole machining gives an exact compression distance and accurate lock ring groove spacing, size, and concentricity. Available in standard size and a wide range of oversize/overbore options for high - performance engine builds. All Manley pistons include a full set of four pistons, piston rings, and hardware. Fitment: Subaru STI 04+, 06+ WRX. Part Number: 612100C - 4 (99.5mm STD Bore, 9.8 Compression Ratio).

These Manley pistons are a great addition to your Subaru WRX or STI engine. To use them, first make sure your engine is clean and ready for installation. Carefully place each piston in the correct cylinder, using the included round wire locks, tool steel wrist pins, and piston rings. Make sure all parts fit snugly. When it comes to maintenance, regularly check the pistons for any signs of wear or damage. Keep the engine well - lubricated to ensure smooth operation. If you notice any unusual noises or performance issues, it's a good idea to have the pistons inspected. Also, follow the manufacturer's recommended service intervals for the best results.