What is the compression ratio of these pistons?

These pistons feature a dish top design that results in an 8.5:1 compression ratio. This is a common choice for turbocharged or supercharged engines that will be running higher boost levels.

What is included with this piston set?

This set includes four pistons, piston rings, and tool steel wrist pins. It is designed to be a complete piston and ring package for your engine build.

Can these pistons be used in California?

No, this piston set is not CARB approved and cannot be shipped to California due to emissions regulations.

Specifications

Brand: Manley Performance
Part #: 615010CE-4
UPC: 807298099972

Manley 98+ Subaru WRX EJ205/STi EJ257 93mm Bore +1mm Oversize 8.5:1 CR Dish Piston Set with Rings

Name: Manley 98+ Subaru WRX EJ205/STi EJ257 93mm Bore +1mm Oversize 8.5:1 CR Dish Piston Set with Rings
Brand: Manley Performance
SKU: manley-performance-manley-98-subaru-wrx-ej205-sti-ej257-93mm-bore-1mm-oversize-8-t14-110034
Price: 893.77 USD
Availability: BackOrder

$893.77

On Backorder

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

Manley 93mm bore +1mm oversize forged piston set for 98+ Subaru WRX EJ205/STi EJ257.

Key Features

Fits 1998 and newer Subaru WRX EJ205 and STi EJ257 engines.
Features a 93mm bore, which is +1mm oversize from stock.
Dish top pistons achieve an 8.5:1 compression ratio, suitable for boosted applications.
Constructed from strong 2618 alloy forgings for superior strength and performance.
Includes tool steel wrist pins for added durability.
Piston skirts have cam and barrel profiles to reduce cylinder wall wear.

This piston set is designed for 1998 and newer Subaru WRX EJ205 and STi 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 the 2618 alloy forgings, these Manley pistons are built for serious performance in your 98+ Subaru WRX EJ205 or STi EJ257. This set is designed for a 93mm bore, which is +1mm oversize from stock, and features a dish top to achieve an 8.5:1 compression ratio. This is a common setup for builds looking to handle more boost and make significant power.

Manley uses proven cam and barrel skirt profiles that help reduce friction and wear on your cylinder walls, even under high stress. The ring lands and grooves are machined to exacting standards, which is crucial for getting a solid seal from your piston rings. This improved seal means more power and better efficiency. The set includes tool steel wrist pins, known for their strength and durability, and comes with rings ready for installation.

When you're rebuilding the heart of your Subaru, using well-built components like these Manley pistons is key. They are designed to work with your engine's specific needs, offering a solid foundation for a high-performance build. Remember, this piston set is not CARB approved and cannot be shipped to California.