What material are these Manley pistons made from?

These Manley Performance pistons are forged from domestic 2618 alloy. This material is chosen for its superior strength and performance characteristics, making it well-suited for high-performance engine builds.

What is the purpose of the moly skirt coating?

The moly skirt coating on select Manley pistons helps to reduce friction and wear on the cylinder walls. This is particularly beneficial during engine break-in and under high-load conditions, contributing to longer piston and cylinder life.

Are these pistons compatible with all Subaru WRX STi models?

These pistons are specifically designed for the Subaru 2.5L EJ257 engine found in certain WRX STi models. It is important to verify the engine code and bore size for your specific vehicle to ensure proper fitment.

Specifications

Brand: Manley Performance
Part #: 652800CE-4
UPC: 807298116884

Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.50mm Bore 1.209in CH, -17.00 CC

Name: Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.50mm Bore 1.209in CH, -17.00 CC
Brand: Manley Performance
SKU: manley-performance-manley-subaru-2-5l-ej257-wrx-sti-piston-set-99-50mm-bore-1-20-t14-880158
Price: 963.51 USD
Availability: BackOrder

$963.51

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Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.50mm Bore 1.209in CH, -17.00 CC. Forged from 2618 alloy for superior strength and performance.

Key Features

Fits Subaru 2.5L WRX STi engines.
Forged from domestic 2618 alloy for superior strength and performance.
Features a moly skirt coating to reduce friction and wear.
Includes premium chrome moly wrist pins for added durability.
Machined with proven cam and barrel skirt profiles for power and cylinder wall protection.
Exacting standards for ring lands and grooves ensure enhanced ring seal.

These pistons are designed for Subaru 2.5L EJ257 engines. Please verify compatibility with your specific vehicle model and year.

⚠️ 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 STi, especially for performance applications, a strong set of pistons is crucial. These Manley Performance pistons are built for the demanding EJ257 engine, designed to handle increased boost and power reliably. They feature a 99.50mm bore, a 1.209-inch compression height, and a -17.00 CC dish volume, making them a solid choice for many performance builds.

Manley uses domestic 2618 alloy forgings for these pistons, which offers superior strength and performance compared to cast aluminum. They also come with a moly skirt coating on select part numbers, which helps reduce friction and wear on the cylinder walls, especially during break-in and under high load. The pistons are machined with proven cam and barrel skirt profiles that help generate power while being gentle on the cylinder walls. Manley also pays close attention to the ring lands and grooves, holding them to strict standards to ensure an enhanced ring seal, which translates directly to more power and better engine efficiency.

Included with these pistons are premium chrome moly wrist pins, known for their durability. Manley's unique fixturing process allows them to machine the skirt and ring grooves in a single operation, ensuring the ring grooves are perfectly square to the skirt. This attention to detail contributes to the overall performance and longevity of the engine. Please note that these pistons are not CARB approved and cannot be shipped to California.