What is the compression ratio with this piston set?

This piston set features a dish top design that results in an 8.5:1 compression ratio when used with the appropriate cylinder head and gasket combination for your EJ257 engine.

What material are the pistons made from?

The pistons are forged from domestic 2618 alloy, which is known for its strength and ability to perform under high-stress conditions found in performance engines.

Does this piston set come with rings and wrist pins?

Yes, this set includes the piston, a ring set, and premium chrome moly wrist pins. It is sold as a single piston, so ensure you order the correct quantity for your engine build.

Specifications

Brand: Manley Performance
Part #: 612001C-1
UPC: 807298084367

Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.55mm +.05mm Bore 8.5:1 Dish Piston/Ring Set - SINGLE

Name: Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.55mm +.05mm Bore 8.5:1 Dish Piston/Ring Set - SINGLE
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-ej257-std-stroke-99-55mm-05mm-bore-8-t14-106899
Price: 189.71 USD
Availability: BackOrder

$189.71

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) STD Stroke 99.55mm +.05mm Bore 8.5:1 Dish Piston/Ring Set - SINGLE. Forged from 2618 alloy for strength.

Key Features

Fits 2004 and later Subaru WRX STi with EJ257 engine.
Forged from domestic 2618 alloy for superior strength and performance.
Features a dish top for an 8.5:1 compression ratio.
Includes premium chrome moly wrist pins.
Piston skirt profiles are designed to be gentle on cylinder walls while generating power.
Exacting standards for ring lands and grooves enhance ring seal and power output.

This piston set is designed for the 2004 and later Subaru WRX STi with the EJ257 engine. It is not CARB approved and cannot ship 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

Manley Performance is well-known for making strong engine components, and this single forged piston and ring set is built for your 2004 and later Subaru WRX STi with the EJ257 engine. If you're rebuilding the heart of your performance Subaru, these pistons are designed to handle the demands of a tuned engine. They feature a dish top, giving you an 8.5:1 compression ratio with a 99.55mm bore size.

These pistons are forged from domestic 2618 alloy, which is a strong material chosen for its ability to withstand high temperatures and pressures common in performance engines. The skirt profiles are designed to be effective at generating power while also being gentle on your cylinder walls, reducing wear over time. Manley also pays close attention to the ring lands and grooves, ensuring a tight seal for better combustion efficiency and more power. Each set comes with premium chrome moly wrist pins.

Keep in mind that this piston set is not CARB approved and cannot be shipped to California. It's a single piston, so be sure to order the correct quantity for your engine build.