What material are these pistons made from?

These Manley pistons are forged from domestic 2618 alloy. This material is chosen for its superior strength and performance characteristics, making it well-suited for high-performance engine builds.

What is the compression ratio of these pistons?

These pistons feature a dish top design that results in an 8.5:1 compression ratio. This is a common ratio for modified Subaru engines, offering a good balance for performance and drivability.

Are these pistons compatible with all 2004+ Subaru WRX/STI models?

These pistons are specifically designed for the EH257 engine found in 2004 and later Subaru WRX and STI models. It's always recommended to confirm your specific engine code to ensure compatibility.

Specifications

Brand: Manley Performance
Part #: 632200CE-4
UPC: 807298088075

Manley 04+ Subaru WRX/STI EH257 99.50mm Bore STD Size 8.5:1 Dish Extreme Duty Piston Set

Name: Manley 04+ Subaru WRX/STI EH257 99.50mm Bore STD Size 8.5:1 Dish Extreme Duty Piston Set
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-eh257-99-50mm-bore-std-size-8-5-1-di-t14-4359520
Price: 887.85 USD
Availability: InStock

$887.85

Only 3 left in stock

Manley 04+ Subaru WRX/STI EH257 99.50mm Bore STD Size 8.5:1 Dish Extreme Duty Piston Set. Forged from 2618 alloy for superior strength and performance.

Key Features

Fits 2004 and later Subaru WRX and STI EH257 engines.
Forged from domestic 2618 alloy for superior strength and performance.
99.50mm bore size, standard for the EH257 engine.
Dish top piston with an 8.5:1 compression ratio.
Features proven cam and barrel skirt profiles for reduced friction and cylinder wall wear.
Exacting standards for ring lands and grooves ensure enhanced ring seal and power.

This piston set is designed for 2004 and later Subaru WRX and STI EH257 engines. Please verify fitment with your specific vehicle's engine code.

⚠️ 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, these Extreme Duty Piston Sets from Manley Performance are a solid choice. These pistons are designed for the EH257 engine and come in a 99.50mm bore size, which is standard. They feature a dish top with an 8.5:1 compression ratio, making them suitable for builds where you need to control detonation or run specific boost levels.

Manley uses domestic 2618 alloy forgings for these pistons, which are known for their strength and ability to handle high performance demands. The pistons also feature proven cam and barrel skirt profiles that help reduce friction and wear on your cylinder walls while still allowing the engine to make good power. You'll also find exacting standards applied to the ring lands and grooves, which is crucial for a good seal and maximizing the power your engine produces. Each set includes premium chrome moly wrist pins, and Manley's unique fixturing process ensures the ring grooves are perfectly square to the skirt for optimal performance.

These pistons are a popular choice among professional engine builders and tuners who rely on Manley for durable, high-performing engine components. Keep in mind 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.