Manley 04+ Subaru WRX/STi (EJ257) 99.75mm Bore 1.2mm x 1.2mm x 2.0mm +.25mm Oversized Ring Set

These Manley Performance piston rings are built with a specific 1.2mm x 1.2mm x 2.0mm face width, a common and effective setup for many performance engine builds. They are designed for a 99.75mm bore, which is +.25mm oversized from the factory specification. This sizing is important when you're rebuilding an EJ257 engine in your 2004-2012 Subaru WRX or STi, especially if the cylinders have been bored out to clean up any imperfections or to achieve a specific clearance.

Manley is known for making well-built internal engine components, and this ring set is no exception. They are designed to provide a good seal between the piston and cylinder wall, which is critical for maintaining compression, controlling oil consumption, and ensuring efficient combustion. Proper ring seal means your engine will run smoothly and make the power it's supposed to.

When you're putting an engine back together, especially a performance-oriented one like the EJ257, the details matter. Using a reputable brand like Manley for your piston rings helps ensure you're starting with a solid foundation for your build. Remember that these rings are not CARB approved and cannot be shipped to California.