JE Pistons Subaru EJ25 Ultra Series 8.5:1 Forged Piston Set – Part Number 361328

Description

The JE Pistons Ultra Series for Subaru EJ25 engines offers industry-leading strength and advanced features designed for high-performance and forced induction applications. Crafted with proprietary Aligned Grain Flow forging technology, these pistons deliver exceptional tensile strength, making them ideal for engines subjected to extreme cylinder pressures from turbocharging or supercharging setups. Each piston is equipped with a thermal barrier crown coating that reflects heat back into the combustion chamber, reducing crown temperatures and enhancing exhaust gas scavenging for improved efficiency and power.
Constructed with high-strength Trend Performance wrist pins made in the USA, these pistons ensure durability under demanding conditions. The skirt coating reduces friction and wear on piston skirts and cylinder walls, while also minimizing noise during cold starts. Optimized pin oiling features maintain proper lubrication of the wrist pins, reducing heat, friction, and component wear. Lateral gas ports are incorporated to sustain a consistent ring seal at high RPMs and boost levels, supporting maximum power output.
Designed specifically for high-horsepower racing engines, each feature of the JE Ultra Series pistons enhances durability, performance, and efficiency. Manufactured entirely in the USA, these pistons are a reliable choice for serious enthusiasts and professional builders aiming to push their Subaru EJ25 engine to its limits. The set includes four pistons compatible with 8.5:1 compression ratio and inverted dome/dish design, tailored for high-performance applications requiring precise fitment and maximum strength. Note that these pistons are not carburetor approved and require carb acknowledgment for installation.

Features:

• Aligned Grain Flow Technology maximizes tensile strength for high-stress environments

• Thermal barrier crown coating reflects heat to improve combustion efficiency

• High-strength Trend Performance wrist pins ensure durability under power-adder conditions

• Skirt coating reduces friction, wear, and operating noise, especially during cold starts

• Optimized pin oiling maintains lubrication for reduced heat and wear

• Lateral gas ports sustain ring seal at high RPM and boost levels

• Designed for high-horsepower racing engines with performance-driven features

• Made entirely in the USA for quality and reliability