Wiseco K588M925AP Forged 92.5 mm -9 cc Pistons for Subaru EJ20 (WRX)

Vehicle Fitment

• Subaru EJ20 2.0 L 16-valve (WRX, Impreza, 1998+)
• Subaru WRX 2002-2005 with 2.0L EJ-series

Features

• Forged from 2618 aerospace-grade aluminum for high strength and fatigue resistance
• -9 cc dish design to lower compression (~8.3-8.4:1), ideal for boosted or high-stress setups
• Armor-Plating (AP) skirt coating to reduce friction and improve durability
• Strutted forging structure for better rigidity and stress handling
• Fully machined crown and ring grooves for optimal sealing
• Forced-pin oiling to ensure reliable lubrication at high RPM
• Includes performance piston ring set (9250TX)
• 23 mm floating wrist pins for strong and reliable connection to the rods

Specifications

• Bore: 92.50 mm
• Compression Height: 32.66 mm
• Piston Volume / Dish: -9.00 cc
• Compression Ratio: ~8.25-8.35:1
• Wrist Pin Diameter: 23 mm
• Piston Material: Forged 2618 aluminum
• Piston Weight (nominal): ~380 g each
• Included Ring Set: 9250TX

Included Components

• 4x forged dished pistons (92.5 mm, -9 cc)
• 4x 23 mm floating wrist pins
• 4x circlips / locks for wrist pins
• 4x piston ring sets (9250TX)

Product Description

The Wiseco K588M925AP piston kit is a performance-grade forged set designed specifically for Subaru EJ20 engines, such as those found in Impreza WRX models. With a 92.5 mm bore and a -9 cc dish, these pistons offer a lower compression ratio (~8.3-8.4:1), making them well-suited for turbocharged builds or engines running high boost.

Built from 2618 aluminum, these pistons deliver excellent strength and durability under racing or high-RPM conditions. The Armor-Plating on the skirts reduces wear and friction, while the strutted forging ensures additional rigidity. Forced-pin oiling helps maintain reliable lubrication, even in high-stress scenarios.

The kit includes a matched 9250TX ring set and 23 mm floating wrist pins to complete your build. When installing, it's important to measure bore-to-wall clearance, ring end gaps, and deck height to ensure optimal performance and longevity, especially with the lower compression design.