What is the purpose of the cam and barrel skirt profiles on these pistons?

These profiles are designed to help the piston generate substantial power while also minimizing wear on your cylinder walls. It's a balance that helps ensure both performance and longevity for your engine.

Are wrist pins included with this piston set?

Yes, this set includes premium chrome moly wrist pins. Manley also offers upgrades to 9310 and Turbo Tuff/DLC alloys on select part numbers for even greater durability.

Can these pistons be shipped to California?

No, these pistons are not CARB approved and cannot be shipped to California due to emissions regulations.

Specifications

Brand: Manley Performance
Part #: 652400C-4
UPC: 807298116600

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-t14-880149
Price: 827.84 USD
Availability: BackOrder

$827.84

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 - 99.50mm Bore 1.130in CH, -26.00 CC. Forged from 2618 alloy for superior strength and performance.

Key Features

Fits Subaru 2.5L EJ257 WRX STi.
Forged from domestic 2618 alloy for superior strength and performance.
Features proven cam and barrel skirt profiles that help generate power while being gentle on cylinder walls.
Exacting standards for piston ring lands and grooves enhance ring seal and power output.
Unique fixturing ensures ultimate ring groove to skirt squareness by machining in a single operation.
Includes premium chrome moly wrist pins for durability.

This piston set is designed for Subaru 2.5L EJ257 engines. Please verify fitment for your specific vehicle application.

⚠️ 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

Starting with domestic 2618 alloy forgings, these Manley pistons are built for serious performance in your Subaru 2.5L EJ257 engine. This set is specifically sized for a 99.50mm bore, with a 1.130-inch compression height and a -26.00cc dish volume, making them a solid choice for rebuilding or upgrading your WRX or STi's heart.

Manley puts a lot of thought into how these pistons interact with the rest of your engine. They feature proven cam and barrel skirt profiles, which help generate power while also being considerate of your cylinder walls during operation. The ring lands and grooves are machined to very strict standards, which is key for getting a good seal from your piston rings and ultimately making more power. Plus, their unique fixturing process allows them to machine the skirt and the ring grooves in one go, ensuring everything is perfectly square for optimal ring seal.

This set includes premium chrome moly wrist pins, known for their durability. For those looking for even more robustness, Manley offers upgrades to 9310 and Turbo Tuff/DLC alloys on select part numbers. These pistons are a popular choice among professional engine builders and tuners who demand reliability and performance from their builds. Please note that these pistons are not CARB approved and cannot be shipped to California.