Cosworth Piston Set Subaru EJ25 99.75mm Bore 9.2:1 Compression

The Cosworth Piston Set for Subaru EJ25 engines features 99.75mm forged pistons with a 9.2:1 compression ratio, delivering exceptional strength, reliability, and thermal stability for high‑performance, turbocharged, and motorsport applications. Engineered for precise fitment and optimal combustion efficiency, these pistons provide improved durability under high boost, elevated RPM, and extreme operating conditions.

Features

• Forged piston set designed for Subaru EJ25 engines
• 99.75mm bore size for rebuilds requiring an oversize piston
• 9.2:1 compression ratio ideal for turbocharged performance setups
• High‑strength forged construction for superior durability
• Enhanced thermal stability for high‑boost and high‑RPM use
• Optimised crown design for efficient combustion and power delivery
• Manufactured to Cosworth’s world‑class motorsport engineering standards

Specifications

• Brand: Cosworth
• Engine Compatibility: Subaru EJ25
• Bore Size: 99.75mm
• Compression Ratio: 9.2:1
• Construction: Forged Aluminium Pistons
• Application: High‑Performance / Turbocharged / Motorsport Builds