What is the compression ratio of these pistons?

These Manley Extreme Duty pistons feature a -17cc dish, which results in a compression ratio of 8.5:1 when installed in the specified EJ257 engine.

What materials are used in the construction of these pistons?

The pistons are forged from domestic 2618 alloy, known for its strength and performance. They also include tool steel wrist pins for added durability.

Are these pistons compatible with all EJ257 engines?

This piston set is specifically designed for 2004 and later Subaru WRX STi models equipped with the EJ257 engine. They are not CARB approved and cannot be shipped to California.

Specifications

Brand: Manley Performance
Part #: 632800CE-4
UPC: 807298108964

Manley 2004+ Subaru WRX STi EJ257 99.50mm Bore 8.5:1 CR -17cc Dish Extreme Duty Piston Set w/Rings

Name: Manley 2004+ Subaru WRX STi EJ257 99.50mm Bore 8.5:1 CR -17cc Dish Extreme Duty Piston Set w/Rings
Brand: Manley Performance
SKU: manley-performance-manley-2004-subaru-wrx-sti-ej257-99-50mm-bore-8-5-1-cr-17cc-d-t14-188167
Price: 963.51 USD
Availability: BackOrder

$963.51

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Manley Extreme Duty forged piston set for 2004+ Subaru WRX STi EJ257. 99.50mm bore, 8.5:1 CR.

Key Features

Fits 2004+ Subaru WRX STi EJ257 engines.
Forged from domestic 2618 alloy for superior strength.
Features a 99.50mm bore and -17cc dish for an 8.5:1 compression ratio.
Includes cam and barrel skirt profiles for efficient operation and cylinder wall protection.
Exacting ring lands and grooves ensure enhanced ring seal and power.
Comes complete with tool steel wrist pins and rings.

This piston set is designed for 2004 and later Subaru WRX STi models with the EJ257 engine. Not CARB approved; cannot ship to California.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

Built from domestic 2618 alloy forgings, these Manley Extreme Duty pistons are made for serious performance in your 2004 and later Subaru WRX STi with the EJ257 engine. They feature a 99.50mm bore and a -17cc dish, resulting in a compression ratio of 8.5:1. This setup is designed to handle increased boost and demanding conditions, making them a solid choice for a performance rebuild.

Manley's signature cam and barrel skirt profiles are incorporated here, which help generate power while also being gentle on your cylinder walls. The ring lands and grooves are machined to exacting standards, which is crucial for getting a good seal from your piston rings and maximizing power output. This attention to detail, along with the included tool steel wrist pins, means these pistons are well-built for durability under stress.

This set includes the pistons, rings, and tool steel wrist pins. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.