What is the compression ratio of this piston?

This Manley Platinum Series piston features a dish design that results in an 8.5:1 compression ratio when used with the appropriate components in your EJ257 engine.

What material are the wrist pins made from?

The pistons come standard with premium chrome moly wrist pins, known for their durability and ability to handle engine stress.

Can this piston be used in California?

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

Specifications

Brand: Manley Performance
Part #: 632400CE-1
UPC: 807298089393

Manley 04+ Subaru WRX/STi (EJ257) 83mm Stroker 99.5mm STD Bore 8.5:1 Dish Platinum Piston - Single

Name: Manley 04+ Subaru WRX/STi (EJ257) 83mm Stroker 99.5mm STD Bore 8.5:1 Dish Platinum Piston - Single
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-ej257-83mm-stroker-99-5mm-std-bore-8-t14-489406
Price: 240.88 USD
Availability: BackOrder

$240.88

On Backorder

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

Manley 04+ Subaru WRX/STi (EJ257) 83mm Stroker 99.5mm STD Bore 8.5:1 Dish Platinum Piston - Single. Forged from 2618 alloy for strength.

Key Features

Fits 2004+ Subaru WRX/STi (EJ257) engines.
Forged from domestic 2618 alloy for superior strength and performance.
Features a 99.5mm standard bore and a dish design for 8.5:1 compression ratio.
Includes proven cam and barrel skirt profiles to reduce cylinder wall wear.
Exacting standards for ring lands and grooves enhance ring seal and power.
Comes with premium chrome moly wrist pins.

This piston is designed for 2004 and later Subaru WRX and STi models equipped with the EJ257 engine. Verify your specific engine code before ordering.

⚠️ 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 Platinum Series pistons are built for serious performance in your 2004 and later Subaru WRX or STi with the EJ257 engine. The 99.5mm standard bore size and 8.5:1 dish compression ratio are designed to handle the demands of a stroker setup, offering a solid foundation for engine builds focused on power and durability.

Manley incorporates proven cam and barrel skirt profiles that help reduce friction and wear on your cylinder walls, while also contributing to improved power output. The ring lands and grooves are machined to exacting standards, which is crucial for achieving a good seal and maximizing the efficiency of your engine. Each piston comes with premium chrome moly wrist pins, and Manley's unique fixturing process ensures the ring grooves are perfectly square to the skirt, a detail that matters for consistent performance under load.

This is a single piston, so be sure to order the correct quantity for your engine build. Please note that this part is not CARB approved and cannot be shipped to California.