JE Pistons Subaru EJ25 Ultra Series 99.50mm Bore Dia -16.5cc 8.5:1 - Piston Set

The JE Pistons Subaru EJ25 Ultra Series piston set is a high-performance forged component designed for Subaru EJ25 engines. Crafted with JE’s proprietary Aligned Grain Flow forging technology, these pistons deliver exceptional tensile strength, making them suitable for extreme cylinder pressures encountered in high-boost or power adder builds. Featuring a 99.50mm bore diameter and a compression ratio of 8.5:1, they include custom enhancements such as thermal barrier crown coating, skirt coating, and gas ports to optimize durability and thermal management. These pistons are built to withstand demanding conditions, providing reliable performance and longevity for serious enthusiasts and professional builders alike.

Designed specifically for Subaru EJ25 engines, these pistons are compatible with models from various years and are ideal for high-performance applications including street, track, and racing. They serve as direct replacements or upgrades for stock pistons in turbocharged or supercharged setups, offering increased strength and thermal efficiency. The set is a bolt-on upgrade that requires no additional modifications, making it suitable for high-boost builds and custom engine projects. Made entirely in the USA, these Ultra Series pistons ensure quality and consistency for demanding automotive applications.