CP Piston Subaru EJ257 WRX STI- Bore (100mm) - Size (+0.5) - CR (8.5) - Single

This is a single CP Pistons forged piston designed for Subaru EJ257 WRX STI engines. It features a 100mm bore, which is 0.5mm over the stock size, and a compression ratio of 8.5:1. This piston is a well-built component for those looking to rebuild or upgrade their performance Subaru engine.

Forged pistons like these are known for their strength and durability, making them a popular choice for high-performance applications where stock cast pistons might not hold up. The 8.5:1 compression ratio is suitable for boosted applications, offering a good balance between power and reliability. This specific piston is sold individually, allowing you to replace exactly what you need or build a custom set.

Keep in mind that this piston is not CARB approved and cannot be shipped to California. Always refer to manufacturer instructions for proper installation and compatibility with your specific engine build.