What is included in this piston set?

This set includes four Manley Performance "Platinum Series" pistons. Each piston is designed for the EJ257 engine and comes with a premium Chrome Moly wrist pin and moly skirt coating.

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 performance characteristics, making it ideal for high-output engines where durability is critical.

Are these pistons compatible with all Subaru EJ257 engines?

This piston set is specifically designed for 2004 and later Subaru WRX and STI models with the EJ257 engine. They feature an 83mm bore and a 99.75mm stroke, intended to achieve a 9.8:1 compression ratio. It's important to confirm these specifications align with your engine build.

Specifications

Brand: Manley Performance
Part #: 632502C-4
UPC: 807298087979

Manley 04+ Subaru WRX/STi (EJ257) 83mm Stroker 99.75mm +.25mm Size Bore 9.8:1 Dish Piston Set

Name: Manley 04+ Subaru WRX/STi (EJ257) 83mm Stroker 99.75mm +.25mm Size Bore 9.8:1 Dish Piston Set
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-ej257-83mm-stroker-99-75mm-25mm-size-t14-4339040
Price: 827.84 USD
Availability: BackOrder

$827.84

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Manley 04+ Subaru WRX/STi (EJ257) 83mm Stroker 99.75mm +.25mm Size Bore 9.8:1 Dish Piston Set. Forged from 2618 alloy for superior strength.

Key Features

Fits 2004+ Subaru WRX/STi (EJ257) engines.
Set includes four forged pistons.
83mm bore size with a 99.75mm stroke.
+.25mm size bore for precise fitment.
9.8:1 compression ratio dish pistons.
Constructed from domestic 2618 alloy forgings for superior strength.

This piston set is designed for 2004 and later Subaru WRX and STI models equipped with the EJ257 engine. 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

This is a set of four Manley Performance "Platinum Series" pistons, designed for 2004 and later Subaru WRX and STI models with the EJ257 engine. These are stroker pistons, measuring 83mm bore with a 99.75mm stroke and a +.25mm size bore, intended to achieve a 9.8:1 compression ratio with their dish design. They come standard with premium Chrome Moly wrist pins and feature a moly skirt coating for reduced friction and wear.

Manley uses domestic 2618 alloy forgings for these pistons, which offers superior strength and performance compared to cast aluminum. The pistons feature proven cam and barrel skirt profiles that help generate power while being gentle on your cylinder walls. Their ring lands and grooves are machined to strict standards, which is crucial for an enhanced ring seal and ultimately, more power. Manley's unique fixturing process allows them to machine the skirt and ring grooves in a single operation, ensuring ultimate squareness between the two critical areas.

These pistons are a popular choice among professional engine builders and tuners who rely on Manley for high-performance engine components. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.