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

Part #: 612100C - 4. These Manley forged and dished pistons for the EJ257 are crafted from high - strength 2618 material. They're lightweight but tough, promising 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 the best control of the groove's size, shape, flatness, and finish. Precise pinhole machining guarantees an accurate compression distance and exact lock ring groove spacing, size, and concentricity. Available in standard size and a wide range of oversize/overbore options, they're perfect for any high - performance engine build. All Manley pistons include a full set of four pistons, piston rings, and hardware. Fitment: Subaru STI 04+ and 06+ WRX. Part Number: 612100C - 4 (99.5mm STD Bore, 9.8 Comp. Ratio).

Using these Manley pistons is straightforward. First, make sure your engine is clean and ready for installation. Carefully place the pistons into the cylinders, ensuring they fit properly. The set comes with all the necessary hardware, so you don't need to worry about sourcing additional parts. When it comes to maintenance, regularly check the piston rings for wear. If you notice any unusual noises or a decrease in engine performance, it could be a sign that the pistons need attention. Keep your engine oil clean and at the right level to help the pistons work smoothly. Also, follow the manufacturer's recommended service intervals for your Subaru WRX or STI. And always remember, these pistons are designed for high - performance engines, so use them accordingly to get the best results.