SKU: K598M100 | UPC: 193564447906
Wiseco EJ257 WRX/STI 4v Dish -19cc 100mm Piston Kit K598M100
The Wiseco K598M100 forged piston shelf stock kit for 2004-2021 Subaru WRX/STI with EJ257 2.5L turbo engine. Boost your engine’s reliability and power with lightweight 2618 alloy pistons featuring -19cc dish for optimized compression in high-boost builds, complete with rings, pins, and clips for race-ready performance.
Key Features
- Forged 2618 Aluminum Alloy: High-tensile strength withstands extreme boost up to 40+ psi without failure.
- -19cc Dish Design: Precision-machined for 8.2:1 compression ratio in tuned setups, promoting detonation resistance.
- Shelf Stock Ready: Includes premium moly rings, wrist pins, and circlips for immediate assembly and balanced operation.
Specifications
| Specification | Detail |
|---|---|
| Part Number | K598M100 |
| Bore Size | 100mm |
| Dish Volume | -19cc |
| Compression Height | 30mm |
| Material | Forged 2618 Aluminum |
| Ring Pack | 1.2mm/1.5mm/2.8mm Moly |
| Quantity | 4 Pistons + Rings, Pins, Clips |
| Country of Origin | United States |
| Warranty | Limited Lifetime |
Product Notes
- Fits 2004-2021 Subaru Impreza WRX/STI EJ257 2.5L Turbo (non-VAB EJ255 compatible with mods)
- 100mm bore for +1mm overstock
- Professional machining required for final bore/hone.
Installation Notes
- Installation Time: 8-12 hours
- Difficulty: Advanced (Professional engine builder recommended
- Tools: micrometer, ring compressor, torque wrench).
- Bore/hone cylinders to 99.99-100.02mm torque rod bolts to 55 ft-lbs clear 8.5mm valves with 1.5mm deck height.
This Part Fits
| Year | Make | Model | Engine |
|---|---|---|---|
| 2004-2021 | Subaru | Impreza WRX / STI | EJ257 2.5L Turbo |
Why Choose Wiseco?
- Industry-leading forged pistons with over 80 years of racing heritage for unmatched durability in boosted applications.
- Precision CNC-machined for perfect fit and balance, trusted in NHRA and rally circuits worldwide.
- SEMA award-winning engineering with lifetime warranty for performance enthusiasts.
Frequently Asked Questions
- Q: What compression ratio does this kit yield?
- A: Approximately 8.2:1 with -19cc dish on EJ257 verify with head gasket and deck height.
- Q: Does it include rings and pins?
- A: Yes, complete shelf stock with moly rings, coated pins, and circlips.
- Q: Compatible with stock rods?
- A: Yes, but upgrade to forged rods for high-boost over 30 psi.
- Q: What’s the bore oversize?
- A: +1mm (100mm) for refreshed or stroker builds; machine to spec.
Shipping & Handling
- Method: UPS/FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Official Wiseco retail box
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