What is the purpose of the dish in these pistons?

The -26cc dish is a specific volume designed into the piston crown. This dish affects the compression ratio of your engine. For performance builds, this dish helps to lower the compression ratio, making it more suitable for boosted applications like turbocharging.

What kind of wrist pins are included?

These pistons come standard with tool steel wrist pins. Tool steel is a strong material chosen for its durability and ability to withstand the stresses within the engine.

Are these pistons suitable for a stock engine rebuild?

These are forged pistons designed for high-performance and boosted applications. While they can be used in a rebuild, they are typically chosen for builds aiming for increased horsepower and torque beyond stock specifications, often requiring other supporting modifications.

Specifications

Brand: Manley Performance
Part #: 652400CE-4
UPC: 807298116624

Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.50mm Bore 1.130in CH, -26.00 CC

Name: Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.50mm Bore 1.130in CH, -26.00 CC
Brand: Manley Performance
SKU: manley-performance-manley-subaru-2-5l-ej257-wrx-sti-piston-set-99-50mm-bore-1-13-t14-880150
Price: 963.51 USD
Availability: BackOrder

$963.51

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Manley Subaru 2.5L WRX STi forged piston set. 99.50mm bore, -26cc dish. Built for high-performance engines.

Key Features

Fits Subaru 2.5L WRX STi EJ257 engines.
Forged from domestic 2618 alloy for superior strength and performance.
Features cam and barrel skirt profiles for efficient power generation and cylinder wall protection.
Includes tool steel wrist pins for added durability.
Exacting standards for piston ring lands and grooves ensure enhanced ring seal.
99.50mm bore size with a -26cc dish.

This piston set is designed for Subaru 2.5L EJ257 engines. Please verify fitment with your specific vehicle and engine build.

⚠️ 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 Subaru WRX STi with the 2.5L EJ257 engine, choosing the right pistons is critical for handling increased boost and power. These forged pistons from Manley are built to handle the demands of a performance-tuned engine, 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 withstand high temperatures and pressures. The pistons feature cam and barrel skirt profiles designed to generate power efficiently while also being gentle on your cylinder walls, which helps with longevity. They also come with tool steel wrist pins and have exacting standards for ring lands and grooves, ensuring a good seal for maximum power output. Manley's unique manufacturing process allows them to machine the skirt and ring grooves in one operation, which helps ensure the ring grooves are perfectly square to the skirt.

This set is for a 99.50mm bore with a -26cc dish, which is a common configuration for many EJ257 builds. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For a high-performance engine build, these Manley pistons are a well-built choice.