What is the advantage of using 2618 alloy forgings?

Domestic 2618 alloy forgings are used because they offer superior strength and performance compared to other materials. This makes the piston more durable under high-performance conditions.

Why is the piston a +.25mm size?

The +.25mm sizing indicates that this piston is slightly larger than the standard bore size. This is typically used when cylinders have been bored out during an engine rebuild or to account for wear.

Can this piston be used in all states?

No, this piston is not CARB approved and cannot be shipped to California due to emissions regulations.

Specifications

Brand: Manley Performance
Part #: 632202CE-1
UPC: 807298088105

Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston - Single

Name: Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston - Single
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-eh257-99-75mm-bore-25mm-size-8-5-1-d-t14-135943
Price: 240.88 USD
Availability: BackOrder

$240.88

On Backorder

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

Manley 04+ Subaru WRX/STI EH257 99.75mm Bore +.25mm Size 8.5:1 Dish Extreme Duty Piston - Single. Built with 2618 alloy for improved strength.

Key Features

Fits 2004 and later Subaru WRX and STI models.
Single Extreme Duty piston with a 99.75mm bore and +.25mm size.
Features an 8.5:1 compression dish, suitable for boosted engines.
Constructed from domestic 2618 alloy forgings for improved strength and durability.
Includes proven cam and barrel skirt profiles to reduce cylinder wall wear.
Exacting ring lands and grooves enhance ring seal for better performance.

This piston is designed for 2004 and later Subaru WRX and STI models. It is a +.25mm size, indicating it is intended for use after cylinder boring.

⚠️ 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

If you're rebuilding the engine in your 2004 and later Subaru WRX or STI, this single Extreme Duty piston from Manley is built to handle the demands of a performance build. It features a 99.75mm bore and is a +.25mm size, meaning it's slightly larger than stock to account for machining or wear. The 8.5:1 compression dish is designed for boosted applications where you need to control detonation.

Manley uses domestic 2618 alloy forgings for these pistons, which offers superior strength compared to cast aluminum, making them a solid choice for high-performance engines. They also feature proven cam and barrel skirt profiles that help reduce friction and wear on your cylinder walls while still allowing the piston to generate power. The ring lands and grooves are machined to strict standards to ensure a good seal, which is crucial for both power and efficiency.

This piston is sold individually, so you'll need to order the correct quantity for your engine. Keep in mind that this part is not CARB approved and cannot be shipped to California.