High-performance forged pistons designed for Subaru EJ25 / EJ257 engines, developed for turbocharged street cars, engine rebuild projects, and serious performance applications.
Available in popular Subaru market sizes, these pistons are suitable for both standard-bore rebuilds and oversized cylinder builds, with support for high-boost and motorsport use.
Recommended Applications
– Turbocharged street builds
– EJ25 / EJ257 engine rebuilds
– High-boost performance setups
– Track and motorsport applications
– Subaru WRX STI projects
Why 8.5:1 Compression Ratio?
For EJ25 / EJ257 turbo builds, 8.5:1 remains one of the most practical and proven compression ratios for customers targeting higher boost pressure and reliable 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
Key Features
– Precision CNC machined from forged blanks
– Designed for boosted Subaru applications
– Reinforced piston structure for demanding load conditions
– Optional coating solutions available
– Optional heavy-duty wrist pin upgrades
– Suitable for both rebuild and upgraded turbo projects
Optional Coating Solutions
– Phosphate coating
– Molybdenum skirt coating
– Ceramic thermal barrier coating
Matching Components
Matching 4340/300M forged connecting rods are also available for Subaru EJ25 / EJ257 applications.
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, material selection, and complete rotating assembly packages.
Contact us for a tailored solution.
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