What is the compression ratio with these pistons?

These pistons feature a dish design that results in a compression ratio of 8.5:1. This is lower than stock and is often chosen for builds that will incorporate forced induction like turbochargers or superchargers.

What is included in this piston set?

This set includes the four forged pistons, a full set of piston rings for each piston, and the necessary premium chrome moly wrist pins.

Are these pistons suitable for a stock engine rebuild?

While these pistons are well-built and offer improved durability, their stroker and overbore dimensions, along with the 8.5:1 compression ratio, make them best suited for performance-oriented engine builds or rebuilds where increased displacement or forced induction is planned.

Specifications

Brand: Manley Performance
Part #: 620005C-4
UPC: 807298067896

Manley 98+ Subaru WRX (EJ205) 79mm +4mm Stroker 92.5mm +0.5mm Bore 8.5:1 Dish Piston Set with Rings

Name: Manley 98+ Subaru WRX (EJ205) 79mm +4mm Stroker 92.5mm +0.5mm Bore 8.5:1 Dish Piston Set with Rings
Brand: Manley Performance
SKU: manley-performance-manley-98-subaru-wrx-ej205-79mm-4mm-stroker-92-5mm-0-5mm-bore-t14-19348
Price: 758.81 USD
Availability: InStock

$758.81

Only 1 left in stock

Fits 2002-2005 Subaru Impreza WRX. Manley 92.5mm forged piston set with rings for improved engine performance and durability.

Key Features

Fits 2002-2005 Subaru Impreza and 2005 Saab 9-2X.
Forged from domestic 2618 alloy for superior strength and performance.
Features a 79mm stroke with a 92.5mm bore (+4mm stroker, +0.5mm overbore).
Dish piston design results in an 8.5:1 compression ratio.
Includes premium chrome moly wrist pins and a full set of rings.
Cam and barrel skirt profiles help reduce cylinder wall wear and improve power.

⚠️ 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 2002-2005 Subaru Impreza WRX, especially if you're looking to increase displacement or handle more power, a set of forged pistons like these from Manley Performance is a solid choice. These pistons are designed to be 4mm over stock stroke at 79mm, with a bore of 92.5mm, and feature a dish shape that results in a compression ratio of 8.5:1. This setup is ideal for building a more robust engine capable of handling increased boost or higher RPMs.

Manley uses domestic 2618 alloy forgings for these pistons, which are known for their strength and ability to withstand the stresses of performance applications. They also feature proven cam and barrel skirt profiles, which help reduce friction and wear on your cylinder walls while still generating substantial power. The ring lands and grooves are machined to strict standards to ensure a good seal, and they come with premium chrome moly wrist pins. Manley's unique manufacturing process ensures the ring grooves are perfectly square to the piston skirt, which is critical for proper ring seal and overall engine health.

This set includes the pistons, rings, and chrome moly wrist pins. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For optimal installation, always refer to the manufacturer's detailed instructions and consult with a professional engine builder if you have any questions about your specific build.