JE Pistons Subaru EJ25 Ultra Series 100mm Bore Dia -17.3cc 8.5:1 0.905in Pin - Piston Set

The JE Pistons Subaru EJ25 Ultra Series piston set is a high-performance forged piston designed for Subaru EJ25 engines. Constructed with JE’s proprietary Aligned Grain Flow forging technology, these pistons offer exceptional tensile strength to withstand the extreme cylinder pressures associated with high-boost and power adder builds. Featuring a 100mm bore diameter and a compression ratio of 8.5:1, they include a -17.3cc dish volume and a 0.905-inch wrist pin. Equipped with thermal barrier crown coating, skirt coating, and gas ports, the Ultra Series pistons deliver enhanced durability, thermal management, and consistent performance for demanding applications. Made entirely in the USA, these pistons are engineered for strength, reliability, and maximum performance in competitive and high-performance street engines.

Designed specifically for Subaru EJ25 engines, these pistons are suitable for engine builds from 1999 to 2010 models. They serve as direct replacements or upgrades for stock pistons in high-performance applications, including turbocharged and supercharged setups. The set is ideal for enthusiasts seeking increased power, durability, and efficiency in street, track, or drag racing environments. Installation involves standard bolt-on procedures, and these pistons are compatible with OEM or aftermarket components designed for the EJ25 platform. They are a perfect choice for high-boost builds requiring reliable, fully featured forged pistons with advanced coatings and construction.