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 but tough, offering a long service life. Every 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 Comp. Ratio).

These Manley pistons are easy to use. First, make sure your engine is suitable for these pistons. The set fits Subaru STI 04+ and 06+ WRX. Before installation, check all the parts in the set - you'll get four pistons, piston rings, and hardware. When installing, handle the pistons carefully as they are lightweight but still need to be installed correctly. Follow the manufacturer's instructions for the best results. For maintenance, regularly check the pistons for any signs of wear or damage. Keep them clean and lubricated to ensure a long service life. If you notice any issues, replace the pistons promptly to avoid engine problems.