What material are these pistons made from?

These Manley pistons are forged from domestic 2618 alloy. This material is chosen for its superior strength and performance capabilities, making it well-suited for demanding engine applications.

What is the compression ratio and bore size for this piston set?

This piston set is designed for a 99.5mm standard bore and features a dish top that results in a 9.8:1 compression ratio. The stroke is de-stroked to 75mm.

Are these pistons compatible with all EJ257 engines from 2004-2012?

Yes, this piston set is specifically designed for the EJ257 engine found in the 2004-2012 Subaru Impreza. They are built to handle the performance requirements of these vehicles.

Specifications

Brand: Manley Performance
Part #: 621100C-4
UPC: 807298067995

Manley 04+ Subaru WRX STi (EJ257) 75mm DE-STROKED 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings

Name: Manley 04+ Subaru WRX STi (EJ257) 75mm DE-STROKED 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-ej257-75mm-de-stroked-99-5mm-std-bor-t14-245930
Price: 758.81 USD
Availability: BackOrder

$758.81

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2004-2012 Subaru Impreza. Manley forged piston set built for performance and durability.

Key Features

Fits 2004-2012 Subaru Impreza.
Forged from domestic 2618 alloy for superior strength and performance.
Features proven cam and barrel skirt profiles that help generate power while being gentle on cylinder walls.
Exacting standards for piston ring lands and grooves ensure enhanced ring seal and more power.
Includes premium chrome moly wrist pins for added durability.
Unique fixturing ensures ultimate ring groove to skirt squareness.

⚠️ 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

Manley Performance is well-known for building strong engine components, and this piston set is a prime example of that commitment. If you're working on a 2004-2012 Subaru Impreza with an EJ257 engine, these pistons are designed to handle the demands of a performance build. They are de-stroked to 75mm with a standard 99.5mm bore and a 9.8:1 compression ratio, making them a solid choice for rebuilding or upgrading your engine's heart.

These pistons are forged from 2618 alloy, a material chosen for its superior strength and ability to perform under pressure. Manley uses proven cam and barrel skirt profiles, which help generate power efficiently while also being gentle on your cylinder walls during operation. The ring lands and grooves are machined to exacting standards, ensuring a better seal for improved power output. For added durability, they come with premium chrome moly wrist pins, and Manley's unique fixturing process ensures the ring grooves are perfectly square to the skirt, contributing to overall engine health and performance.

This set includes the pistons and rings needed to get your engine back together. Please note 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.