What is the advantage of using 2618 alloy forgings?

2618 alloy forgings are used because they offer superior strength and performance compared to other materials. This makes them well-suited for demanding engine builds where durability and power output are critical.

What does the 8.5:1 compression dish mean for my engine?

The 8.5:1 compression dish is a specific design feature that helps achieve a target compression ratio for your engine build. This ratio is important for balancing power, fuel efficiency, and detonation resistance.

Are these pistons coated on the skirts?

Select Manley piston part numbers feature moly skirt coatings for added durability and reduced friction. Please check the specific product details for this part number to confirm if a skirt coating is included.

Specifications

Brand: Manley Performance
Part #: 632005C-4
UPC: 807298089348

Manley 04+ Subaru WRX/STi (EJ257) 75mm DE-Stroker 100.00mm +.50mm Size Bore 8.5:1 Dish Piston Set

Name: Manley 04+ Subaru WRX/STi (EJ257) 75mm DE-Stroker 100.00mm +.50mm Size Bore 8.5:1 Dish Piston Set
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-ej257-75mm-de-stroker-100-00mm-50mm--t14-4339031
Price: 827.84 USD
Availability: InStock

$827.84

Only 1 left in stock

Manley 04+ Subaru WRX/STi (EJ257) 75mm DE-Stroker 100.00mm +.50mm Size Bore 8.5:1 Dish Piston Set. Built with 2618 alloy forgings for superior strength.

Key Features

Fits 2004+ Subaru WRX/STI (EJ257).
Forged from domestic 2618 alloy for superior strength and performance.
100.00mm bore size, +.50mm over standard.
8.5:1 compression dish.
Features cam and barrel skirt profiles for power and cylinder wall protection.
Exacting standards for ring lands and grooves enhance ring seal.

⚠️ 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

Built using domestic 2618 alloy forgings, these Manley pistons are a solid choice for anyone rebuilding or upgrading their 2004 and later Subaru WRX or STI with the EJ257 engine. The 100.00mm bore size, which is +.50mm over standard, is paired with an 8.5:1 compression dish, making them suitable for builds aiming for specific compression ratios and power output.

Manley's signature cam and barrel skirt profiles are designed to help generate substantial power while also being gentle on your cylinder walls, which is crucial for engine longevity. They also feature exacting standards for ring lands and grooves, which helps ensure a better ring seal and ultimately, more power. The included wrist pins are premium Chrome Moly, and Manley's unique fixturing process allows for skirt turning and ring groove machining in a single operation. This ensures ultimate squareness between the ring groove and the skirt, a detail that matters for consistent performance.

This set is not CARB approved and cannot be shipped to California. It's important to note that these pistons are designed for specific engine builds and require careful installation. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.