High-performance forged pistons designed for Subaru EJ25 / EJ257 engines, developed for turbocharged street cars, engine rebuild projects, high-boost applications, and motorsport use.
This version features a ceramic thermal barrier coating on the piston crown together with a molybdenum anti-friction coating on the piston skirt, providing additional thermal protection and reduced skirt friction compared with our standard phosphate-coated version.
Available in popular Subaru market specifications, these pistons are suitable for both standard-bore rebuilds and oversized cylinder applications.
Recommended Applications
– Turbocharged street builds
– EJ25 / EJ257 engine rebuilds
– High-boost performance setups
– Track and motorsport applications
– Subaru WRX STI projects
– Performance builds requiring improved thermal management
Why 8.5:1 Compression Ratio?
For EJ25 / EJ257 turbo builds, 8.5:1 remains a practical and widely used compression ratio for customers targeting higher boost pressure while maintaining a reasonable tuning margin.
It offers a balanced direction for:
– Strong turbocharged performance
– Better detonation margin under boost
– Reliable use in performance-oriented street and track builds
– High-output EJ25 / EJ257 engine projects
Coating Configuration
Ceramic Crown Coating
The ceramic thermal barrier coating helps reduce heat transfer into the piston crown and piston body, supporting improved thermal management in high-temperature turbocharged applications.
Molybdenum Skirt Coating
The molybdenum anti-friction skirt coating helps reduce friction between the piston skirt and cylinder wall while providing additional wear protection during demanding operating conditions.
Key Features
– Precision CNC machined from forged blanks
– Designed for boosted Subaru EJ applications
– Ceramic crown coating for thermal protection
– Molybdenum skirt coating for reduced friction
– Reinforced piston structure for demanding load conditions
– Optional heavy-duty wrist pin upgrades
– Suitable for rebuild, high-boost, and motorsport projects
Matching Components
Matching forged connecting rods are also available for Subaru EJ25 / EJ257 applications.
Material options include:
– 4340 Forged Steel
– 300M Steel
– Aluminum Alloy
– Titanium Alloy
Bolt options include:
– ARP Bolts
– 4340 Bolts
– 300M Bolts
Custom Support
Need a custom piston setup for your EJ25 / EJ257 build?
We also support custom solutions based on your project requirements, including special bore sizes, compression ratio changes, material selection, coating configurations, and complete rotating assembly packages.
Contact us for a tailored solution.
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