JE Ultra Series forged piston set for the Subaru EJ257 (STI). 99.75mm bore, 9.5:1 compression. Uses JE's Aligned Grain Flow forging for maximum tensile strength, with a thermal-barrier crown coating, skirt coating, lateral gas ports and Trend high-strength wrist pins — built for high-boost power-adder builds. Made in the USA. Set of 4.
| Type | Ultra Series forged piston set |
| Engine | Subaru EJ257 (STI) |
| Bore | 99.75mm |
| Compression | 9.5:1 |
| Features | Aligned Grain Flow, thermal-barrier crown, gas ports |
| Material | Forged aluminum |
| Quantity | Set of 4 |
| Part Number | 361331 |
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