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 characteristics, making it well-suited for high-output engines.

What is the purpose of the cam and barrel skirt profiles?

The cam and barrel skirt profiles are designed to manage piston movement within the cylinder bore. This helps to reduce noise and minimize wear on the cylinder walls, contributing to longer engine life and consistent performance.

Are these pistons compatible with all Subaru WRX STi models?

These pistons are specifically designed for the 2.5L EJ257 engine found in certain Subaru WRX STi models. It is crucial to verify that your engine code matches and to consult with your engine builder or Manley's specifications to ensure compatibility with your specific build, including compression ratio targets.

Specifications

Brand: Manley Performance
Part #: 652802CE-4
UPC: 807298116303

Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.75mm Bore 1.209in CH, -17.00 CC

Name: Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.75mm Bore 1.209in CH, -17.00 CC
Brand: Manley Performance
SKU: manley-performance-manley-subaru-2-5l-ej257-wrx-sti-piston-set-99-75mm-bore-1-20-t14-880162
Price: 963.51 USD
Availability: BackOrder

$963.51

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Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.75mm Bore 1.209in CH, -17.00 CC. Forged from 2618 alloy for superior strength in high-performance engines.

Key Features

Fits Subaru 2.5L EJ257 engines.
Forged from domestic 2618 alloy for superior strength and performance.
Features proven cam and barrel skirt profiles to reduce cylinder wall wear.
Exacting standards for ring lands and grooves enhance piston ring seal.
Includes durable chrome moly wrist pins.
99.75mm bore size with a 1.209 inch compression height and -17.00 CC dish volume.

This piston set is designed for Subaru 2.5L EJ257 engines. Please consult manufacturer fitment data to confirm compatibility with your specific vehicle and build.

⚠️ 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 pistons are a strong choice for anyone rebuilding or upgrading their Subaru 2.5L EJ257 engine. The 99.75mm bore size is a common upgrade over stock, and the 1.209 inch compression height combined with a -17.00 CC dish volume is designed to work with specific head and crank combinations for optimal compression ratios in performance applications.

Manley puts a lot of thought into how these pistons perform inside the cylinder. They feature proven cam and barrel skirt profiles, which help manage piston rock and reduce wear on your cylinder walls while still allowing the engine to make good power. The ring lands and grooves are machined to very strict standards, which is crucial for getting a good seal from your piston rings. This attention to detail means better power output and more reliable performance. The pistons also come standard with chrome moly wrist pins, known for their durability, and Manley's unique fixturing allows them to machine the skirt and ring grooves in one operation, ensuring they are perfectly square to each other for the best possible ring seal.

If you're building a high-performance Subaru engine, these pistons are a solid option. Keep in mind that these are not CARB approved and cannot be shipped to California. It's always a good idea to consult with your engine builder or refer to Manley's technical documentation to ensure these pistons are the right fit for your specific build and desired compression ratio.