Wiseco Professional Series Subaru EJ257 WRX/STI 4v Dish -19cc 100mm Piston Kit (K598M100AP)

Fits Subaru WRX and STI models equipped with the EJ257 engine.

Wiseco Professional Series forged racing pistons are engineered for high-performance builders who require exceptional durability in heavy to severe-duty applications. Forged and precision-machined in the USA from 2618 aluminum alloy, these pistons provide the increased tensile strength necessary for high-boost or high-RPM EJ257 builds. This shelf stock kit delivers custom-level performance features in a ready-to-install package.

Every piston in this kit is treated with Wiseco’s proprietary ArmorGlide skirt coating, which reduces friction and provides seizure resistance while ensuring quieter operation. The design includes fully machined crowns with anti-detonation grooves to protect the ring lands and improve seal under extreme cylinder pressures. Forced pin oiling is also integrated to ensure the wrist pins receive constant lubrication during high-load operation.

• 2618 Forged Aluminum: High-strength alloy optimized for racing and forced induction.
• ArmorGlide Skirt Coating: Minimizes friction and protects against cylinder wall scuffing.
• Precision Ring Grooves: Enhanced ring seal with integrated anti-detonation grooves.
• Forced Pin Oiling: Directs oil to the wrist pin for improved longevity.

Technical Specifications:

• Engine: Subaru EJ257 (4-Valve)
• Bore Size: 100mm
• Piston Volume: -19cc Dish
• Material: 2618 Forged Aluminum
• Manufacturer Part Number: K598M100AP
• Included: Premium piston rings and wrist pins