What makes these pistons different from stock?

These pistons are forged from 2618 alloy, which is stronger than typical cast aluminum found in stock pistons. They also feature specific skirt profiles and precise ring land machining for improved performance and durability in modified engines.

Can these pistons be used in California?

No, these pistons are not CARB approved and cannot be shipped to California due to emissions regulations.

Specifications

Brand: Manley Performance
Part #: 632200C-1
UPC: 807298085869

Manley 04+ Subaru WRX/STI EH257 99.50mm Bore STD Size 8.5:1 Dish Piston Set - Single Piston

Name: Manley 04+ Subaru WRX/STI EH257 99.50mm Bore STD Size 8.5:1 Dish Piston Set - Single Piston
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-eh257-99-50mm-bore-std-size-8-5-1-di-t14-329957
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 04+ Subaru WRX/STI forged piston set. 99.50mm bore, 8.5:1 dish for improved performance and durability.

Key Features

Fits 2004 and later Subaru WRX and STI models with the EH257 engine.
Set includes four pistons, each 99.50mm bore size with a standard 8.5:1 compression dish.
Constructed from domestic 2618 alloy forgings for superior strength and performance.
Features proven cam and barrel skirt profiles to balance power generation and cylinder wall wear.
Ring lands and grooves are machined to strict standards for enhanced ring seal.
Includes premium chrome moly wrist pins for added durability.

This piston set is designed for 2004 and later Subaru WRX and STI models equipped with the EH257 engine. Please verify your specific engine code before ordering.

⚠️ 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

This set includes four forged pistons, each measuring 99.50mm in bore size with a standard 8.5:1 compression dish. These pistons are built for the 2004 and later Subaru WRX and STI models using the EH257 engine. They are designed to handle the demands of performance engines, offering a solid foundation for your build.

Manley uses domestic 2618 alloy forgings for these pistons, which are known for their strength and ability to perform under pressure. The pistons feature proven cam and barrel skirt profiles, which help generate power while also being considerate of your cylinder walls during operation. The ring lands and grooves are machined to strict standards to ensure a good seal, and they come with chrome moly wrist pins for added durability. Manley's unique machining process ensures the ring grooves are perfectly square to the skirt, contributing to overall engine efficiency.

Keep in mind that these pistons are not CARB approved and cannot be shipped to California. If you're rebuilding the engine in your 04+ WRX or STI and need reliable, well-built pistons, this set from Manley is a popular choice among engine builders.