Manley 99.5mm STD Bore Pistons Subaru WRX 2002-2014 / STI 2004-2021 | 612000C-4

Part #: 612000C - 4. Manley offers these high - quality forged and dished pistons for the EJ257 engine. Crafted from high - strength 2618 material, they're both lightweight and built to last. Each set comes with round wire locks, tool steel wrist pins, and piston rings at no extra cost. Our special multi - step top ring groove machining ensures perfect control of size, geometry, flatness, and finish. Pinhole machining is precise, giving you an exact compression distance and accurate lock ring groove spacing, size, and concentricity. Available in standard size and a wide range of oversize options, they're ideal for any high - performance engine build. All Manley pistons come with a complete set of four pistons, piston rings, and hardware. (99.5mm STD Bore, 8.5 Comp. Ratio)

These Manley pistons are great for your Subaru WRX or STI engine. To install them, first make sure your engine is clean and free of debris. Carefully place the pistons in the cylinders, using the included wrist pins and rings. Make sure everything is properly aligned before tightening any bolts. When using your engine, keep an eye on the temperature and oil pressure. If you notice any unusual noises or vibrations, stop using the engine right away and check for problems. For maintenance, change the engine oil regularly as recommended by your vehicle's manual. This will help keep the pistons in good condition and ensure a long service life. Remember, these pistons come with a full set of four, so you can replace all at once for the best performance.