What is a DE-Stroker piston and what do I need to know about it?

A DE-Stroker piston is designed to work with a specific crankshaft that has a shorter stroke than the factory setup. This allows for a different piston deck height and compression ratio. You will need to ensure you are using the correct crankshaft and connecting rods that are compatible with this DE-Stroker piston set for proper engine assembly.

What material are these pistons made from and why is it important?

These pistons are forged from domestic 2618 alloy. This material is chosen for its superior strength and ability to withstand the high temperatures and pressures found in performance engines, making it a reliable choice for demanding builds.

Are these pistons compatible with all EJ257 engines?

These pistons are specifically designed for the 2004 and later Subaru WRX and STi models with the EJ257 engine. They feature a 99.75mm bore size, which is +.25mm over the standard bore. It's important to ensure your engine block is machined to this specific bore size for a proper fit.

Specifications

Brand: Manley Performance
Part #: 632002CE-4
UPC: 807298089324

Manley 04+ Subaru WRX/STi (EJ257) 75mm DE-Stroker 99.75mm +.25mm Size Bore 8.5:1 Piston Set (ED)

Name: Manley 04+ Subaru WRX/STi (EJ257) 75mm DE-Stroker 99.75mm +.25mm Size Bore 8.5:1 Piston Set (ED)
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-ej257-75mm-de-stroker-99-75mm-25mm-s-t14-124546
Price: 963.51 USD
Availability: BackOrder

$963.51

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Manley 04+ Subaru WRX/STi (EJ257) 75mm DE-Stroker 99.75mm +.25mm Size Bore 8.5:1 Piston Set (ED). Forged from 2618 alloy for superior strength in high-performance builds.

Key Features

Fits 2004+ Subaru WRX/STi (EJ257) engines.
Forged from domestic 2618 alloy for superior strength and performance.
DE-Stroker design with a 99.75mm bore size (+.25mm over).
8.5:1 compression ratio suitable for boosted applications.
Features proven cam and barrel skirt profiles for efficient power and cylinder wall protection.
Exacting ring lands and grooves enhance ring seal for more power.

These pistons are designed for 2004 and later Subaru WRX and STi models equipped with the EJ257 engine. They are a DE-Stroker design and come in a 99.75mm bore size.

⚠️ 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 rebuilding the engine in your 2004 and later Subaru WRX or STi with the EJ257 engine, a strong set of pistons is crucial for handling increased power. These Manley "Platinum Series" pistons are built to handle the demands of a performance engine build, offering a solid foundation for your project.

Manley uses domestic 2618 alloy forgings for these pistons, which are known for their strength and ability to withstand high temperatures and pressures. They feature proven cam and barrel skirt profiles designed to generate power efficiently while also being gentle on your cylinder walls. The ring lands and grooves are machined to strict standards, which helps ensure a better seal for improved power output. These pistons are also a DE-Stroker design, meaning they are intended for a specific crankshaft configuration, and come in a 99.75mm bore size, which is +.25mm over standard. The 8.5:1 compression ratio is suitable for boosted applications where you need to control detonation.

Included with this set are premium chrome moly wrist pins, and Manley's unique fixturing process ensures the ring groove squareness with the skirt. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For a complete build, you'll want to ensure you have the correct crankshaft and connecting rods to match the DE-Stroker design and bore size.