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2.5L 16v - EJ257 with EJ20 cylinder head
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2.5L 16v - EJ257 with EJ20 cylinder head
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Table of forged pistons EJ257 + cylinder heads EJ20 (hybrid): Ø 99.50 mm, pin 23 mm, CH 30.70 mm, RV 8.2–8.4:1. Compatibility EJ257/EJ205/EJ207, STi vehicles and OEM part numbers.
Specifications of the forged pistons offered by NSB Concept for Subaru 2.5 L — EJ257 short block with cylinder heads EJ20 (EJ205/EJ207) :
| Reference | OEM Bore 99,50 mm | OEM CR 8,2–8,4 :1 | OEM Pin 23 mm | Height OEM Pin 30,70 mm | Range | Coating | Aluminium | Forging | Dome | Weight | Rings |
|---|---|---|---|---|---|---|---|---|---|---|---|
| JE-291059 | 99.5 | 8.5:1 | 23 | 30.7 | JE FSR | NC | 2618 | FSR | -25.5 | 405.0 | NC |
| JE-367902 | 99.5 | 8.5:1 | 23 | 30.7 | JE Ultra Series | Crown + Skirt | 2618 | FSR | -25.5 | 413.0 | NC |
| JE-325249 | 99.5 | 9.5:1 | 23 | 30.7 | JE FSR | NC | 2618 | FSR | -16.4 | 411.0 | NC |
| K9263D025 | 99.75 | 8.1:1 | 23 | 31.0 | Wossner | NC | NC | Slipper | -28.0 | NC | 997XPY |
| K9467D025 | 99.75 | 8.4:1 | 23 | 30.7 | Wossner | NC | NC | Slipper | -25.3 | NC | 997XPY |
| JE-296349 | 99.75 | 8.5:1 | 23 | 30.7 | JE FSR | NC | 2618 | FSR | -26.0 | 410.0 | NC |
| JE-367903 | 99.75 | 8.5:1 | 23 | 30.7 | JE Ultra Series | Crown + Skirt | 2618 | FSR | -26.0 | 415.0 | NC |
| K9131D025 | 99.75 | 8.6:1 | 23 | 30.7 | Wossner | NC | NC | Slipper | -23.0 | NC | 997XPY |
| K9550D025 | 99.75 | 9:1 | 23 | 30.7 | Wossner | NC | NC | NC | -19.0 | NC | 997XPY |
| JE-325250 | 99.75 | 9.5:1 | 23 | 30.7 | JE FSR | NC | 2618 | FSR | -16.7 | 414.0 | NC |
| K9263D050 | 100.0 | 8.2:1 | 23 | 31.0 | Wossner | NC | NC | Slipper | -28.0 | NC | 1000XPY |
| JE-291060 | 100.0 | 8.5:1 | 23 | 30.7 | JE FSR | NC | 2618 | FSR | -26.4 | 410.0 | NC |
| JE-367904 | 100.0 | 8.5:1 | 23 | 30.7 | JE Ultra Series | Crown + Skirt | 2618 | FSR | -26.4 | 417.0 | NC |
| K9467D050 | 100.0 | 8.5:1 | 23 | 30.7 | Wossner | NC | NC | Slipper | -25.3 | NC | 1000XPY |
| K9131D050 | 100.0 | 8.6:1 | 23 | 30.7 | Wossner | NC | NC | Slipper | -23.0 | NC | 1000XPY |
| K9550D050 | 100.0 | 9:1 | 23 | 30.7 | Wossner | NC | NC | NC | -19.0 | NC | 1000XPY |
| JE-325251 | 100.0 | 9.5:1 | 23 | 30.7 | JE FSR | NC | 2618 | FSR | -17.0 | 416.0 | NC |
| K9263D100 | 100.5 | 8.2:1 | 23 | 31.0 | Wossner | NC | NC | Slipper | -28.0 | NC | 1005XPY |
| K9467D100 | 100.5 | 8.5:1 | 23 | 30.7 | Wossner | NC | NC | Slipper | -25.3 | NC | 1005XPY |
| K9131D100 | 100.5 | 8.7:1 | 23 | 30.7 | Wossner | NC | NC | Slipper | -23.0 | NC | 1005XPY |
| K9550D100 | 100.5 | 9.1:1 | 23 | 30.7 | Wossner | NC | NC | NC | -19.0 | NC | 1005XPY |
Compatibility (engine codes):
Original vehicles equipped with the EJ257 2.5 Turbo (base short block) :
| Brand | Model | Engine code | Power | Years |
|---|---|---|---|---|
| Subaru | Impreza WRX STi (GD) 2.5 Turbo | EJ257 | 300 hp (≈305 hp) | 2004 – 2007 |
| Subaru | Impreza WRX STi (GR/GV) 2.5 Turbo | EJ257 | 305 hp (≈309 hp) | 2008 – 2014 |
| Subaru | WRX STi (VA) 2.5 Turbo | EJ257 | 310 hp (≈314 hp) | 2015 – 2021 (US) |
OEM piston references :
EJ257 (Ø 99.5): 12006AC390 (piston & pin — Standard A), other classes/updates depending on model years. Check in the Subaru EPC (FAST) via VIN.
Original dimensional markers: Ø 99.50 mm — pin Ø 23.00 mm — CH ≈ 30.70 mm.
the exact references may vary (market EU/US/JDM, years & classes A/B). Check by VIN mandatory.
Warning: Before installation, please verify the integrity and conformity of each component of the piston kit as well as the correctness of the assembly in the engine; any warranty is strictly limited to the parts included in the piston kit.
