What material are these pistons made from?

These Manley pistons are forged from domestic 2618 alloy. This material is chosen for its strength and ability to perform under high-stress conditions found in performance engines.

What is the purpose of the skirt coating?

While not all part numbers include it, select Manley pistons feature a moly skirt coating. This coating helps to reduce friction between the piston skirt and the cylinder wall, leading to improved performance and longevity.

Are these pistons compatible with all Subaru 2.5L engines?

This specific piston set is designed for the EJ257 engine variant found in certain WRX and STi models. It's important to verify your engine code to ensure proper fitment, as other 2.5L Subaru engines may have different specifications.

Specifications

Brand: Manley Performance
Part #: 652405CE-4
UPC: 807298116709

Manley Subaru 2.5L EJ257 WRX STi Piston Set - 100.00mm Bore 1.130in CH, -26.00 CC

Name: Manley Subaru 2.5L EJ257 WRX STi Piston Set - 100.00mm Bore 1.130in CH, -26.00 CC
Brand: Manley Performance
SKU: manley-performance-manley-subaru-2-5l-ej257-wrx-sti-piston-set-100-00mm-bore-1-1-t14-880126
Price: 963.51 USD
Availability: BackOrder

$963.51

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Manley Subaru 2.5L EJ257 WRX STi Piston Set - 100.00mm Bore 1.130in CH, -26.00 CC. Forged pistons built for high-performance Subaru engines.

Key Features

Fits Subaru 2.5L EJ257 WRX and STi engines.
100.00mm bore size.
Forged from domestic 2618 alloy for superior strength and performance.
Features proven cam and barrel skirt profiles to reduce friction and wear.
Exacting standards for ring lands and grooves enhance ring seal and power.
Includes premium chrome moly wrist pins.

This piston set is designed for Subaru 2.5L EJ257 engines. Always confirm compatibility with your specific vehicle's engine code before purchase.

⚠️ 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

Secure CheckoutFast Shipping631-982-0042

About this part

Product Details

If you're rebuilding the engine in your Subaru WRX or STi with the 2.5L EJ257 engine, a solid set of pistons is crucial. This set from Manley Performance is built using their signature "Platinum Series" construction, designed to handle the demands of a performance-tuned engine. They feature a 100.00mm bore size, which is a common upgrade or replacement size for this engine platform.

Manley uses domestic 2618 alloy forgings for these pistons, which are known for their strength and ability to withstand higher cylinder pressures and temperatures compared to cast pistons. The pistons also feature proven cam and barrel skirt profiles, which help to reduce friction and wear on the cylinder walls while still allowing the engine to make good power. You'll also find exacting standards for the ring lands and grooves, which is key for a good seal and maximizing engine output. These pistons come with premium chrome moly wrist pins, and Manley's unique fixturing process ensures the ring grooves are perfectly square to the skirt for optimal performance.

It's important to note that these pistons are not CARB approved and cannot be shipped to California. When rebuilding an engine, always refer to the manufacturer's specifications for proper installation, ring gap, and assembly procedures. This set is a popular choice among professional engine builders and tuners looking for a well-built piston for their EJ257 build.