What is the advantage of using forged pistons like these?

Forged pistons are made from a solid block of metal that is heated and hammered into shape, making them significantly stronger and more durable than cast pistons. This strength is crucial for handling the higher pressures and temperatures found in performance or racing engines.

What does 'de-stroked' mean in relation to these pistons?

A de-stroked piston set means the piston's compression height (the distance from the wrist pin center to the piston crown) is shorter than stock. This is often done to achieve a specific compression ratio or to allow for a longer connecting rod in a performance build.

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

Yes, these pistons are designed specifically for the 2004-2012 Subaru Impreza with the EJ257 engine. However, it is always recommended to confirm your specific engine code and consult with your engine builder to ensure compatibility with your complete build.

Specifications

Brand: Manley Performance
Part #: 621002C-4
UPC: 807298067957

Manley 04+ Subaru WRX STi (EJ257) 75mm DE-STROKED 99.75mm +.25mm Bore 8.5:1 Dish Piston Set w/ Rings

Name: Manley 04+ Subaru WRX STi (EJ257) 75mm DE-STROKED 99.75mm +.25mm Bore 8.5:1 Dish Piston Set w/ Rings
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-ej257-75mm-de-stroked-99-75mm-25mm-b-t14-245268
Price: 758.81 USD
Availability: BackOrder

$758.81

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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 de-stroked design with a 99.75mm bore (+.25mm overbore).
8.5:1 compression ratio dish helps manage combustion in boosted engines.
Cam and barrel skirt profiles reduce cylinder wall wear while improving power.
Exacting ring lands and grooves ensure enhanced ring seal for more power.

⚠️ 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 dedication. 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 a de-stroked set, meaning they have a shorter stroke than stock, with a bore of 99.75mm, which is a +.25mm overbore from the standard 99.5mm. The 8.5:1 compression ratio dish helps manage combustion pressure in boosted applications.

These pistons are forged from domestic 2618 alloy, a material chosen for its superior strength and ability to withstand high temperatures and pressures. They feature proven cam and barrel skirt profiles, which help reduce friction and wear on your cylinder walls while still generating substantial power. The ring lands and grooves are machined to exacting standards to ensure a better seal, leading to more efficient combustion and improved power output. Manley's unique fixturing process allows them to machine the skirt and ring grooves in one operation, ensuring they are perfectly square to each other for ultimate reliability.

This set includes premium chrome moly wrist pins, known for their durability. For those pushing their engines to the absolute limit, Manley offers upgrades to even stronger alloys. 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.