CP Piston & Ring Set for Subaru EJ20 WRX - Bore (92mm) - Size (Standard) - Compression Ratio (8.5)

CP Pistons is well-known for building serious engine components for performance applications. If you're working on the EJ20 engine in your 2002-2005 Subaru Impreza or Saab 9-2X, this forged piston and ring set is designed to handle the demands of a performance build. These pistons are made to fit a 92mm bore, which is the standard size for this engine, so you won't need to machine the cylinders larger unless you're going for an oversized build. The 8.5:1 compression ratio is a solid choice for builds that plan to use boost, offering a good balance between power and reliability.

Forged pistons like these are a significant upgrade over cast pistons. They are made from a solid block of aluminum that's heated and hammered into shape, making them much stronger and more resistant to the extreme pressures and temperatures found in a high-performance engine. This strength means they can better withstand the stresses of increased boost, higher RPMs, and more aggressive tuning. This set includes the pistons and the necessary rings, making it a complete package for rebuilding or upgrading your engine's short block.

When installing these pistons, it's important to follow the manufacturer's recommended clearances and lubrication procedures to ensure a long service life. Because these are performance parts, they are often paired with upgraded connecting rods and a robust engine management system to take full advantage of their capabilities. Keep in mind that this part cannot be shipped to California due to CARB regulations.