What is the advantage of using 2618 alloy forgings?

The 2618 alloy is chosen for its superior strength and ability to withstand high temperatures and pressures. This makes it a reliable choice for performance engines that will be subjected to demanding conditions.

What does the 9.8:1 dish compression ratio mean for my engine?

A 9.8:1 compression ratio is a moderate increase over stock, designed to work with stroker crankshafts and performance tuning. It aims to balance increased power output with the ability to run on pump gasoline, depending on other engine modifications and tuning.

Are these pistons coated?

Select Manley 'Platinum Series' pistons feature moly skirt coatings for improved performance and durability. Please check the specific product details for this part number to confirm if a coating is included.

Specifications

Brand: Manley Performance
Part #: 632502CE-4
UPC: 807298088174

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

Name: Manley 04+ Subaru WRX/STi (EJ257) 83mm Stroker 99.75mm Bore 9.8:1 Dish Extreme Duty Piston Set
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-ej257-83mm-stroker-99-75mm-bore-9-8--t14-4362573
Price: 887.85 USD
Availability: InStock

$887.85

Only 1 left in stock

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

Key Features

Fits 2004 and later Subaru WRX and STi models with the EJ257 engine.
Features 83mm stroker dimensions with a 99.75mm bore and 9.8:1 compression dish.
Constructed from domestic 2618 alloy forgings for superior strength and performance.
Includes tool steel wrist pins for added durability.
Designed with exacting standards for piston ring lands and grooves to enhance ring seal.
Utilizes cam and barrel skirt profiles to reduce friction and cylinder wall wear.

These pistons are designed for 2004 and later Subaru WRX and STi models equipped with the EJ257 engine. Not CARB approved and cannot be shipped 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

Starting with the 2618 alloy forgings, these Manley pistons are built for serious performance in your 2004 and later Subaru WRX or STi with the EJ257 engine. They're designed as an 83mm stroker set, meaning they work with a crankshaft that has a longer stroke, and they feature a 99.75mm bore with a 9.8:1 compression dish. This setup is aimed at builders looking for a robust foundation for a high-output engine.

Manley uses domestic 2618 alloy, which is known for its strength and ability to handle high temperatures and pressures, making it a popular choice for performance builds. The pistons also come with tool steel wrist pins, offering solid durability for the forces they'll endure. You'll find exacting standards applied to the ring lands and grooves, which is crucial for getting a good seal with your piston rings, translating directly into more power and better engine efficiency. The cam and barrel skirt profiles are carefully shaped to reduce friction and wear on your cylinder walls while still allowing the engine to make substantial power.

What's notable is Manley's unique fixturing process. It allows them to machine the skirt and the ring grooves in one go. This ensures that the ring grooves are perfectly square to the piston skirt, which is essential for optimal ring seal and overall engine health. These pistons are part of Manley's 'Platinum Series,' a well-known line trusted by many professional engine builders and tuners for their reliability and performance gains. Keep in mind these are not CARB approved and cannot be shipped to California.