JE Pistons 361329 Ultra Series Forged Piston Set for Subaru EJ25 100mm

Vehicle Fitment

• 2002-2007 Subaru WRX STI (EJ257, AWD)
• 2006-2007 Subaru Forester STI (EJ257, AWD)
• 2008-2014 Subaru WRX STI (EJ257, AWD)
• 2015-2021 Subaru WRX STI (EJ257, AWD)
• 2022-2025 Subaru WRX STI (EJ257, AWD)

Features

• Forged 2618 T6 high-tensile aluminum construction for enhanced strength
• Inverted dome/dish design for optimized combustion efficiency
• Precision CNC machining for consistent quality and performance
• Compatible with high-boost applications and nitrous setups
• Designed for both press-fit and floating wrist pin configurations
• Includes wrist pins, locks, and JE Pro Seal premium piston rings
• Made 100% in the USA
• Ideal for both street and track applications

Specifications

• Bore Diameter: 100.00 mm (3.937 inches)
• Compression Height: 1.209 inches (30.70 mm)
• Piston Volume: -17.30 cc
• Compression Ratio: Approximately 8.5:1 (calculated with 0.0" deck clearance & 0.040" gasket)
• Piston Material: Forged 2618 aluminum
• Piston Head Type: Inverted Dome/Dish
• Wrist Pin Diameter: 0.905 inches (23.00 mm)
• Wrist Pin Length: 2.250 inches (57.15 mm)
• Average Piston Weight: 430 grams
• Ring Set Included: Yes (1.2 x 1.2 x 2.5 mm)
• Pin Locks Included: Yes

Included Components

• 1x JE Ultra Series Piston Set (4 pistons)
• 1x Ring Set (4 sets)
• 1x Wrist Pin Set (4 pins)
• 1x Pin Lock Set (4 locks)

Product Description

The JE Pistons 361329 Ultra Series Piston Set is engineered for high-performance applications in Subaru's EJ25 engine, found in the 2002 and newer WRX STI and Forester STI models. These pistons are ideal for enthusiasts seeking to enhance their engine's performance, especially in applications involving forced induction or high-revving setups.

Constructed from forged 2618 T6 aluminum, these pistons offer superior strength and durability, making them suitable for high-boost builds. The inverted dome/dish design optimizes combustion efficiency, while the skirt coating minimizes wear on piston skirts and cylinder walls.

The kit includes a ring set, wrist pins, and pin locks, ensuring all necessary components are provided for installation. With a compression ratio of approximately 8.5:1, these pistons are compatible with both naturally aspirated and forced induction setups, including turbocharged and supercharged applications.