What is the compression ratio of these pistons?

These Manley Turbo Tuff Series pistons feature a -17cc dish, which results in a compression ratio of 8.5:1 when installed in the appropriate EJ25 engine configuration. This is a common ratio for turbocharged applications.

Are these pistons suitable for a stock engine rebuild?

These are performance forged pistons designed for high-output and modified engines. While they can be used in a rebuild, they are best suited for builds aiming for increased power and durability under boosted conditions, often paired with other performance engine components.

What is included with this piston set?

This set includes the pistons, piston rings, and chrome moly wrist pins. It is designed to be a comprehensive solution for replacing or upgrading the pistons in your Subaru WRX EJ25 engine.

Specifications

Brand: Manley Performance
Part #: 632802C-4
UPC: 807298109060

Manley Subaru WRX EJ25 99.75mm -17cc Dish 8.5:1 CR Turbo Tuff Series Piston Set w/ Rings

Name: Manley Subaru WRX EJ25 99.75mm -17cc Dish 8.5:1 CR Turbo Tuff Series Piston Set w/ Rings
Brand: Manley Performance
SKU: manley-performance-manley-subaru-wrx-ej25-99-75mm-17cc-dish-8-5-1-cr-turbo-tuff--t14-222982
Price: 827.84 USD
Availability: BackOrder

$827.84

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Manley Subaru WRX EJ25 99.75mm -17cc Dish 8.5:1 CR Turbo Tuff Series Piston Set w/ Rings. Forged pistons for improved strength and durability.

Key Features

Fits Subaru WRX EJ25 engines.
Forged from domestic 2618 alloy for superior strength and performance.
Features a 99.75mm bore size and a -17cc dish, creating an 8.5:1 compression ratio.
Includes proven cam and barrel skirt profiles to reduce friction and cylinder wall wear.
Exacting ring lands and grooves ensure enhanced ring seal for more power.
Comes with premium chrome moly wrist pins for added durability.

This piston set is designed for Subaru WRX EJ25 engines. Please verify compatibility with your specific vehicle's engine configuration.

⚠️ 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 building a high-performance Subaru WRX with an EJ25 engine, these Manley Turbo Tuff Series pistons are a solid choice for serious power. They're designed to handle the demands of boosted applications, offering a significant step up from stock components. This set is specifically for the EJ25 engine and features a 99.75mm bore size with a -17cc dish, resulting in a compression ratio of 8.5:1, which is ideal for forced induction setups.

Manley uses domestic 2618 alloy forgings for these pistons, which are known for their strength and ability to withstand high temperatures and pressures common in performance engines. The pistons feature proven cam and barrel skirt profiles that help reduce friction and wear on your cylinder walls, contributing to both power gains and longevity. The ring lands and grooves are machined to strict standards to ensure a good seal with your piston rings, which is crucial for making maximum power and maintaining engine health. Each set also includes premium chrome moly wrist pins for added durability.

This set comes complete with rings, making it a convenient option for your engine build. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For optimal results, always refer to the manufacturer's installation instructions and consult with a professional engine builder.