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Wiseco K598M100 forged piston close-up dish design
Complete K598M100 kit with rings pins clips
Installed Wiseco pistons in EJ257 engine assembly
Bore and compression specs diagram
Wiseco K598M100 forged piston close-up dish design
Wiseco K598M100 forged piston close-up
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Wiseco Subaru EJ257 WRX/STI 4v Dish -19cc 100mm Piston Shelf Stock Kit

Wiseco
WISK598M100
193564447906
Piston Sets - Forged - 4cyl
Out of stock
$ 784.99

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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