What is the compression ratio for this piston set?

This Mahle MS Piston Set is designed with a 9.0 compression ratio. This is achieved through the piston's -14.1cc dish volume and other engine specifications.

Are these pistons compatible with my stock connecting rods?

Yes, these pistons are designed to work with stock connecting rods and feature a 23mm wrist pin. This makes them a suitable choice for many Subaru WRX 2.5L engine rebuilds.

What does 'boxed strut construction' mean for these pistons?

Boxed strut construction refers to an internal reinforcement design within the piston. It adds rigidity and strength to the piston structure, helping it withstand the pressures and heat of combustion.

Mahle Subaru WRX 2.5L Piston Set 930285437

Name: Mahle MS Piston Set Subaru WRX 2.5L 100mm Bore 79mm Stroke Stock Rod 23mm Pin-14cc 9.0 CR Set of 4
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-subaru-wrx-2-5l-100mm-bore-79mm-stroke-stock-rod-23mm--t14-368053
Price: 913.82 USD
Availability: BackOrder

Mahle MS Piston Set Subaru WRX 2.5L 100mm Bore 79mm Stroke Stock Rod 23mm Pin-14cc 9.0 CR Set of 4

$913.82

On Backorder

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

Mahle MS Piston Set for Subaru WRX 2.5L. 100mm bore, 9.0 CR. Engine Piston Set

Key Features

This is a set of four Mahle MS pistons for Subaru WRX 2.5L engines.
Features a 100mm bore and a 79mm stroke.
Designed with a 9.0 compression ratio and a -14.1cc dish volume.
Built with boxed strut construction for added strength.
Compatible with stock connecting rods and a 23mm wrist pin.
Each piston weighs 409g.

This piston set is designed for Subaru WRX 2.5L engines. Please verify compatibility with your specific vehicle application.

⚠️ 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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Product Details

If you're rebuilding the engine in your Subaru WRX with the 2.5L engine, a solid set of pistons is crucial for performance and reliability. This Mahle MS Piston Set is built for that job, offering a 100mm bore and a 9.0 compression ratio, designed to work with your stock connecting rods and a 23mm wrist pin. Mahle is a well-known name in engine components, and these pistons are made with a boxed strut construction for added strength.

These pistons feature a 79mm stroke and a -14.1cc dish volume, contributing to that 9.0 compression ratio. Each piston weighs in at 409g, and the overall length from the pin center to the piston top is 30.7mm, with a total rod length of 130.5mm. This set is designed as a direct replacement for the factory pistons, making the installation process more straightforward if you're already familiar with engine rebuilds. It's important to note that this set is not CARB approved and cannot be shipped to California.

This set includes four pistons, ready to be installed in your WRX. When undertaking an engine rebuild of this magnitude, ensure you have all the necessary supporting components and follow the manufacturer's specifications for assembly and break-in to get the most out of your new Mahle pistons.