What is the main advantage of forged pistons over cast pistons?

Forged pistons are made from a stronger aluminum alloy that is heated and hammered into shape. This process creates a denser, more durable piston that can better handle higher cylinder pressures and temperatures compared to cast pistons.

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

An 8.5:1 compression ratio indicates the ratio of the cylinder volume when the piston is at the bottom of its stroke compared to when it's at the top. A lower ratio like this is often chosen for modified engines to allow for more boost or to run on lower octane fuel while still providing improved performance over stock.

Does this piston set come with rings and pins?

This JE Pistons kit includes the pistons themselves. It is recommended to check the manufacturer's product details or contact JE Pistons directly to confirm if piston rings and wrist pins are included in this specific part number.

2002-2005 Subaru Impreza Piston Set | JE Pistons

Name: JE Pistons SUB WRX EJ20 92.5mm Bore CR 8.5 KIT Set of 4 Pistons
Brand: JE Pistons
SKU: je-pistons-je-pistons-sub-wrx-ej20-92-5mm-bore-cr-8-5-kit-set-of-4-pistons-t14-295490
Price: 899.99 USD
Availability: BackOrder

JE Pistons SUB WRX EJ20 92.5mm Bore CR 8.5 KIT Set of 4 Pistons

$899.99

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2002-2005 Subaru Impreza. JE Pistons forged piston set with 92.5mm bore and 8.5:1 compression ratio.

Key Features

Fits 2002-2005 Subaru Impreza and 2005 Saab 9-2X.
Set of 4 forged pistons from JE Pistons.
Features a 92.5mm bore size.
Compression ratio is 8.5:1.
Forged construction offers improved strength and durability over cast pistons.
Designed for the Subaru EJ20 engine.

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Fits these vehicles

Saab 9-2X 2005
Subaru Impreza 2002-2005

Product Details

This is a set of four JE Pistons designed for the 2002-2005 Subaru Impreza WRX with the EJ20 engine. These pistons feature a 92.5mm bore and a compression ratio of 8.5:1, making them a solid choice for rebuilding or upgrading your engine's internals. If you're looking to enhance performance or replace worn-out pistons, this forged set offers a durable foundation.

JE Pistons are well-known for their forged construction, which uses a stronger aluminum alloy than cast pistons. This process creates a piston that can better withstand the higher pressures and temperatures found in performance or modified engines. The 8.5:1 compression ratio is a good balance for many applications, offering improved torque and power potential without being overly sensitive to fuel quality. The 92.5mm bore size is specific to certain EJ20 engine builds, so ensure this matches your engine's requirements. This kit includes all four pistons needed for a complete engine rebuild.

When installing these pistons, it's important to follow the manufacturer's recommended clearances and lubrication procedures. Proper ring gap setting and piston orientation are critical for engine longevity. This kit is designed as a direct replacement for the specified Subaru models, simplifying the installation process for a mechanic.