What is the primary material used for these pistons and why is it important?

These pistons are forged from domestic 2618 alloy. This material is chosen for its exceptional strength and ability to withstand the high temperatures and pressures found in performance-tuned engines, making them a durable choice for engine builds.

Do these pistons come with piston rings?

This listing is for the Manley Performance piston set only. Piston rings are typically sold separately, and it's recommended to purchase rings specifically designed for your engine and these piston dimensions for optimal performance and sealing.

Are these pistons compatible with all Subaru 2.5L engines?

These pistons are specifically designed for the EJ257 engine found in certain Subaru WRX and STi models, with a 99.75mm bore. While they are for a 2.5L engine, it's crucial to confirm your exact engine code and bore size to ensure proper fitment, as other 2.5L Subaru engines may have different specifications.

Specifications

Brand: Manley Performance
Part #: 652502C-4
UPC: 807298116761

Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.75mm Bore 1.130in CH, -14.00 CC

Name: Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.75mm Bore 1.130in CH, -14.00 CC
Brand: Manley Performance
SKU: manley-performance-manley-subaru-2-5l-ej257-wrx-sti-piston-set-99-75mm-bore-1-13-t14-880155
Price: 827.84 USD
Availability: BackOrder

$827.84

On Backorder

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Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.75mm Bore 1.130in CH, -14.00 CC. Forged from 2618 alloy for strength and durability in high-performance engines.

Key Features

Fits Subaru 2.5L WRX and STi models with the EJ257 engine.
Forged from domestic 2618 alloy for superior strength and performance.
Features proven cam and barrel skirt profiles for reduced cylinder wall wear and improved power.
Exacting standards for piston ring lands and grooves enhance ring seal and power output.
Includes premium chrome moly wrist pins for added durability.
Unique fixturing ensures ultimate squareness between ring groove and piston skirt.

This piston set is designed for Subaru 2.5L EJ257 engines found in WRX and STi models. Please verify your specific engine code and bore size 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

If you're rebuilding the engine in your Subaru 2.5L WRX or STi, this Manley Performance Piston Set is built for serious performance. These pistons are specifically sized for a 99.75mm bore, a 1.130-inch compression height, and feature a -14.00 CC dish, making them a solid choice for boosting your EJ257 engine's power and reliability.

Manley uses domestic 2618 alloy forgings for these pistons, which are known for their strength and ability to handle the stresses of high-performance applications. They also feature proven cam and barrel skirt profiles designed to reduce friction and wear on your cylinder walls while still generating substantial power. The ring lands and grooves are machined to very strict standards, which helps ensure a better seal from your piston rings, leading to more efficient combustion and improved power output. For added durability, these pistons come standard with premium chrome moly wrist pins, and Manley's unique fixturing process allows for skirt turning and ring groove machining in a single operation, ensuring ultimate squareness between the ring groove and the piston skirt.

This set is not CARB approved and cannot be shipped to California. It's important to note that for a complete engine build, you'll want to ensure you have all the necessary supporting components, including new piston rings, connecting rod bearings, and potentially a new oil pump and timing belt kit, depending on the condition of your original parts.