Manley 99.75mm Bore +.25mm Oversized Ring Set Subaru WRX / STI EJ257 2004-2021

Part #: 46997 - 4. Manley's Subaru EJ257 pistons are a top - notch choice. They come with Napier style second rings and high - tension oil rings by Total Seal, which provide excellent oil control. This is a 99.75mm bore, 1.2mm x 1.2mm x 2.0mm +.25mm oversized ring set, perfect for 2004 and later Subaru WRX/STi (EJ257) vehicles.

Using this Manley ring set is easy. First, make sure your engine is clean and in good condition before installation. Carefully place the rings on the pistons following the correct order and orientation. When installing, be gentle to avoid any damage to the rings. As for maintenance, check the oil regularly. The high - tension oil rings help with oil control, but keeping an eye on the oil level and quality is crucial. Also, after a long period of use, inspect the rings for any signs of wear or damage. If you notice any issues, it's best to replace the rings promptly to keep your engine running smoothly.