What is the advantage of using 2618 alloy forgings?

The 2618 alloy is chosen for its superior strength and performance characteristics, making it well-suited for high-performance engine builds. This material can better withstand the stresses of increased power output and demanding operating conditions compared to other alloys.

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

These specific profiles on the piston skirt are designed to optimize the piston's movement within the cylinder. They help to reduce friction and wear on the cylinder walls while still allowing the piston to generate substantial power efficiently.

Are any additional components needed for installation?

This is a piston set, and while it includes wrist pins, you will need to source appropriate piston rings and potentially bearings for your specific engine build. Always refer to the manufacturer's installation instructions for a complete list of recommended components and procedures.

Specifications

Brand: Manley Performance
Part #: 632402C-4
UPC: 807298089423

Manley 04+ Subaru WRX/STi (EJ257) 83mm Stroker 99.75mm +.25mm Size Bore 8.5:1 Dish Piston Set

Name: Manley 04+ Subaru WRX/STi (EJ257) 83mm Stroker 99.75mm +.25mm Size Bore 8.5:1 Dish Piston Set
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-ej257-83mm-stroker-99-75mm-25mm-size-t14-4339037
Price: 827.84 USD
Availability: BackOrder

$827.84

On Backorder

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Manley 83mm stroker piston set for 04+ Subaru WRX/STi (EJ257). Forged 2618 alloy construction for superior strength and performance.

Key Features

Fits 2004 and later Subaru WRX and STI models with the EJ257 engine.
Features an 83mm bore size and 99.75mm stroke for stroker engine builds.
Dish volume creates an 8.5:1 compression ratio, suitable for forced induction applications.
Constructed from domestic 2618 alloy forgings for superior strength and performance.
Includes proven cam and barrel skirt profiles that reduce cylinder wall wear.
Exacting ring land and groove machining enhances ring seal for improved power.

This piston set is designed for 2004 and later Subaru WRX and STI models equipped with the EJ257 engine. It is not CARB approved and cannot be shipped to California.

⚠️ 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

Built from domestic 2618 alloy forgings, these Manley pistons are a solid choice for anyone looking to build a serious EJ257 engine for their 2004 and later Subaru WRX or STI. The 83mm bore size, combined with a 99.75mm stroke and a dish volume that results in an 8.5:1 compression ratio, makes them ideal for stroker builds where improved torque and power under the curve are the goals.

Manley puts a lot of thought into the details that make a difference. You'll find 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 exacting standards to ensure a tight seal, which is critical for both performance and engine longevity. They even use unique fixturing that allows them to machine the skirt and ring grooves in one operation, ensuring they are perfectly square to each other. This attention to detail helps prevent issues down the road and contributes to a well-performing engine.

This set includes premium chrome moly wrist pins, known for their durability. For those pushing the limits, Manley offers upgrades to even stronger 9310 or Turbo Tuff/DLC alloys on select part numbers. These pistons are a significant upgrade over stock and are intended for performance builds. Please note that these are not CARB approved and cannot be shipped to California.