CJM x JE Utra EJ25, Pro Mod Series Piston

CJM x JE Ultra Pro Mod Subaru EJ257 Piston Set

JE Ultra, Subaru, EJ Series, Inverted Dome/Dish, 4 Cyl. Piston Kit

Ultra Series forged pistons from JE are among the strongest and most fully featured off-the-shelf pistons available for Subaru performance engines. Designed to withstand the extreme cylinder pressures of high-boost Subaru builds, Ultra Series pistons utilize JE’s proprietary Aligned Grain Flow forging technology, delivering exceptional tensile strength ideal for power-adder applications.

Each piston includes custom-level features such as a thermal-barrier crown coating, skirt coating, gas ports, and additional durability and performance enhancements. Made 100% in the USA, JE Ultra Series pistons are an ideal choice for Subaru builders seeking maximum reliability and power.

• Ultra Series Pistons – Key Features
• Built for High Power: Engineered specifically for high-horsepower racing applications.
• Aligned Grain Flow Technology: Exclusive JE forging process that maximizes tensile strength for extreme engine loads.
• Skirt Coating: Minimizes friction, wear, and cold-start noise.
• Thermal Barrier Crown Coating: Ceramic coating reflects heat back into the combustion chamber, lowering crown temps and improving exhaust scavenging.
• High-Strength Wrist Pins: Thick-wall Trend Performance pins made in the USA for high-power and power-adder engines.
• Lateral Gas Ports: Maintain strong top-ring seal under high RPM and high boost.
• Optimized Pin Oiling: Enhanced oiling passages reduce heat, friction, and wear on pins and small ends.
• Made in the USA.