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

Part #: 612000C - 4. These Manley forged and dished pistons for the EJ257 are crafted from high - strength 2618 material. They're lightweight but built to last. Each set comes with round wire locks, tool steel wrist pins, and piston rings at no extra cost. A special multi - step machining process for the top ring groove ensures perfect control of size, shape, flatness, and finish. Pinhole machining is so precise that it gives 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 great for any high - performance engine build. All Manley pistons include a full set of four pistons, piston rings, and hardware. (99.5mm STD Bore, 8.5 Comp. Ratio)

Using these Manley pistons is straightforward. Just follow your engine's installation guide and use the included piston rings and hardware. When installing, make sure to handle the pistons gently to avoid any damage. For maintenance, regularly check the pistons for signs of wear or damage. If you notice any issues, replace the pistons as soon as possible. Also, keep the engine well - lubricated to ensure smooth operation and a long service life. Remember, these pistons are designed for high - performance engines, so use them in the right setup for the best results.