How many pistons do I need to order?

This part number is for a single piston. You will need to order one piston for each cylinder in your engine. For a typical Subaru WRX/STI with an EH257 engine, this means ordering four pistons.

What is the benefit of the 2618 alloy forging?

The 2618 alloy is a strong material commonly used in performance pistons. It offers good strength and durability, making it suitable for engines that experience higher stresses than stock applications.

What does the '8.5:1 Dish' specification mean?

The 8.5:1 refers to the compression ratio, which is a measure of how much the air-fuel mixture is compressed in the cylinder. 'Dish' indicates the shape of the piston top, which in this case is recessed, contributing to the overall compression ratio when paired with your cylinder heads.

Specifications

Brand: Manley Performance
Part #: 632200CA-1
UPC: 807298085883

Manley 04+ Subaru WRX/STI EH257 99.50mm STD (Grade A) Bore 8.5:1 Dish Piston (SINGLE PISTON)

Name: Manley 04+ Subaru WRX/STI EH257 99.50mm STD (Grade A) Bore 8.5:1 Dish Piston (SINGLE PISTON)
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-eh257-99-50mm-std-grade-a-bore-8-5-1-t14-4317175
Price: 206.96 USD
Availability: BackOrder

$206.96

On Backorder

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Manley 04+ Subaru WRX/STI EH257 99.50mm STD (Grade A) Bore 8.5:1 Dish Piston (SINGLE PISTON). Built with 2618 alloy for strength.

Key Features

Fits 2004 and up Subaru WRX/STI EH257 engines.
Standard bore size of 99.50mm.
8.5:1 compression ratio with a dish top.
Constructed from domestic 2618 alloy forgings for strength.
Includes chrome moly wrist pins.
Features cam and barrel skirt profiles for performance and cylinder wall protection.

This piston is designed for 2004 and up Subaru WRX/STI models with the EH257 engine. Please verify compatibility with your specific vehicle and engine configuration.

⚠️ 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 up Subaru WRX or STI with the EH257 engine, this Manley 99.50mm standard bore piston is a solid choice. It features an 8.5:1 compression ratio with a dish top, designed to work with your specific engine configuration. Manley uses domestic 2618 alloy forgings for these pistons, which are known for their strength and ability to handle the demands of performance engines.

These pistons are well-built with proven cam and barrel skirt profiles that help generate power while being gentle on your cylinder walls. The ring lands and grooves are machined to exacting standards, which is crucial for a good ring seal and maximizing the power your engine makes. Each piston also comes with chrome moly wrist pins, and Manley's unique fixturing allows for precise machining of the skirt and ring grooves in one operation, ensuring they are perfectly square to each other.

Keep in mind that this piston is sold individually, so be sure to order the correct quantity for your engine. Also, note that this part is not CARB approved and cannot be shipped to California.