How many pistons do I need to order for my engine?

This part is sold as a single piston. You will need to order one piston for each cylinder in your engine. For a typical Subaru WRX or STI, this means ordering four pistons.

What is the compression ratio of this piston?

This piston features a dish design that results in an 8.5:1 compression ratio. This is a common ratio for modified Subaru engines, offering a balance between power and drivability.

What is the wrist pin made of and is it included?

The piston includes premium chrome moly wrist pins, which are known for their strength and durability. These wrist pins are standard with this piston.

Specifications

Brand: Manley Performance
Part #: 632200CB-1
UPC: 807298085890

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

Name: Manley 04+ Subaru WRX/STI EH257 99.50mm STD (Grade B) Bore 8.5:1 Dish Piston (SINGLE PISTON)
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-eh257-99-50mm-std-grade-b-bore-8-5-1-t14-4317176
Price: 206.96 USD
Availability: InStock

$206.96

In Stock

Manley 04+ Subaru WRX/STI EH257 99.50mm STD (Grade B) Bore 8.5:1 Dish Piston (SINGLE PISTON). A well-built forged piston for improved engine performance.

Key Features

Fits 2004 and newer Subaru WRX and STI models.
Single piston with a 99.50mm standard bore size.
Features an 8.5:1 compression ratio due to its dish design.
Constructed from strong 2618 alloy forgings for durability.
Includes chrome moly wrist pins for added strength.
Designed with cam and barrel skirt profiles for efficient power and cylinder wall protection.

This piston is designed for 2004 and newer Subaru WRX and STI models. Please verify compatibility with your specific vehicle's engine code.

⚠️ 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 single forged piston is a prime example. If you're working on an 04+ Subaru WRX or STI and need a replacement or upgrade piston, this 99.50mm standard bore unit is designed to handle the demands of performance engines.

This piston is forged from 2618 alloy, a material chosen for its strength and ability to perform under pressure. It features a dish design that results in an 8.5:1 compression ratio, which is a common target for modified Subaru engines. Manley also uses proven cam and barrel skirt profiles that help generate power while being easier on your cylinder walls. The ring lands and grooves are machined to strict standards to ensure a good seal, and it comes with chrome moly wrist pins for added durability.

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