What material are these Manley pistons made from?

These pistons are forged from domestic 2618 alloy. This material is chosen for its strength and ability to perform well under high temperatures and pressures common in performance engines.

What is the purpose of the cam and barrel skirt profiles?

The cam and barrel profiles are specific shapes machined into the piston skirt. They help the piston move smoothly within the cylinder wall, reducing friction and wear while contributing to overall engine power.

Are these pistons compatible with all Subaru WRX STi models?

These pistons are specifically designed for the 2.5L EJ257 engine found in certain Subaru WRX STi models and require a 100.00mm bore. It's important to verify your engine code and bore size before purchasing.

Specifications

Brand: Manley Performance
Part #: 652805C-4
UPC: 807298116969

Manley Subaru 2.5L EJ257 WRX STi Piston Set - 100.00mm Bore 1.209in CH, -17.00 CC

Name: Manley Subaru 2.5L EJ257 WRX STi Piston Set - 100.00mm Bore 1.209in CH, -17.00 CC
Brand: Manley Performance
SKU: manley-performance-manley-subaru-2-5l-ej257-wrx-sti-piston-set-100-00mm-bore-1-2-t14-880129
Price: 827.84 USD
Availability: BackOrder

$827.84

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Manley Subaru 2.5L EJ257 WRX STi Piston Set - 100.00mm Bore 1.209in CH, -17.00 CC. Built for high-performance engines needing strong, durable pistons.

Key Features

Fits Subaru 2.5L EJ257 WRX STi engines.
Forged from domestic 2618 alloy for superior strength and performance.
Features proven cam and barrel skirt profiles for smooth operation and power.
Ring lands and grooves are machined to strict standards for enhanced ring seal.
Includes premium chrome moly wrist pins for durability.
Pistons are designed for a 100.00mm bore and have a 1.209 inch compression height.

These pistons are designed for Subaru 2.5L EJ257 engines with a 100.00mm bore. Always confirm compatibility with your specific 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, these Manley Performance pistons are a solid choice for serious builds. They are specifically made for a 100.00mm bore, which is a common size for performance-oriented engine work on these cars. Manley has been a go-to brand for many professional engine builders because they focus on making parts that hold up under demanding conditions.

These pistons are forged from 2618 alloy, a material known for its strength and ability to handle high temperatures and pressures without deforming. They feature proven cam and barrel skirt profiles, which help them run smoothly against the cylinder walls while still allowing for significant power gains. The ring lands and grooves are machined to very tight tolerances, which is crucial for getting a good seal from your piston rings, leading to better compression and more power. Each set comes with chrome moly wrist pins, which are strong and durable for everyday performance use.

When you're putting together a high-performance engine, attention to detail matters. Manley's unique manufacturing process ensures that the ring grooves are perfectly square to the piston skirt, which contributes to that all-important ring seal. Keep in mind these pistons are not CARB approved and cannot be shipped to California. For builds aiming for maximum performance and reliability, these Manley pistons are a well-built component that many tuners and builders trust.