What material is this piston made from?

This Manley piston is forged from domestic 2618 alloy. This material is chosen for its strength and ability to perform under high heat and pressure, making it suitable for performance engine builds.

Does this piston come with a wrist pin?

Yes, this piston includes a premium chrome moly wrist pin. Manley also offers upgrades to 9310 and Turbo Tuff/DLC alloys for even greater durability on select part numbers.

What does 'Size B' and '8.5 CR' mean for this piston?

Size B indicates the piston's bore diameter is 99.5mm. The 8.5 CR refers to the compression ratio, meaning this piston is designed to achieve an 8.5:1 compression ratio in the specified engine application.

Specifications

Brand: Manley Performance
Part #: 632800CB-1
UPC: 807298108988

Manley 04+ Subaru WRX/STi (EJ257) STD Stroke 99.5mm Bore 8.5 CR Size B Piston (Single)

Name: Manley 04+ Subaru WRX/STi (EJ257) STD Stroke 99.5mm Bore 8.5 CR Size B Piston (Single)
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-ej257-std-stroke-99-5mm-bore-8-5-cr--t14-325349
Price: 206.96 USD
Availability: BackOrder

$206.96

On Backorder

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

Manley forged piston for 04+ Subaru WRX/STi (EJ257) with 99.5mm bore. Built with 2618 alloy for strength.

Key Features

Fits 2004+ Subaru WRX/STi (EJ257) with 99.5mm bore.
Forged from domestic 2618 alloy for superior strength and performance.
Features cam and barrel skirt profiles that balance power generation with cylinder wall protection.
Ring lands and grooves are machined to exacting standards for enhanced ring seal.
Includes a premium chrome moly wrist pin.
Size B piston with an 8.5:1 compression ratio.

This piston is designed for 2004 and later Subaru WRX and STi models with the EJ257 engine and a 99.5mm bore size.

⚠️ 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 making strong engine components that go into serious builds. If you're working on your 2004 and up Subaru WRX or STi with the EJ257 engine, this single forged piston is built to handle the demands of performance tuning and engine rebuilding.

This piston is forged from domestic 2618 alloy, which is a strong material chosen for its ability to withstand high temperatures and pressures. It features a proven cam and barrel skirt profile designed to be effective while also being easy on your cylinder walls. The ring lands and grooves are machined to strict standards, which helps ensure a good seal for better power output. Manley's unique machining process allows them to turn the skirt and machine the ring grooves in one operation, ensuring the grooves are perfectly square to the skirt for optimal performance.

This piston is a size B, meaning it's 99.5mm in bore size and has an 8.5:1 compression ratio. It comes with a premium chrome moly wrist pin. Keep in mind that this part is not CARB approved and cannot be shipped to California.