What material are these Mahle pistons made from?

These Mahle MS pistons are forged from 2618 aluminum. This material is chosen for its strength and ability to handle the demands of performance engines.

What is the compression ratio achieved with this piston set?

With a -14.1cc dish volume, these pistons achieve a 9.0:1 compression ratio when used with the stock Subaru WRX 2.5L cylinder head.

Are these pistons compatible with aftermarket connecting rods?

These pistons are designed to work with stock-length connecting rods (130.5mm) and feature a 23mm wrist pin. Compatibility with aftermarket rods would depend on their specific dimensions matching these requirements.

Mahle Subaru WRX 2.5L Forged Piston Set 99.75mm Bore 9302854

Name: Mahle MS Piston Set Subaru WRX 2.5L 99.75mm 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-99-75mm-bore-79mm-stroke-stock-rod-23m-t14-368052
Price: 913.82 USD
Availability: BackOrder

Mahle MS Piston Set Subaru WRX 2.5L 99.75mm 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. Features 99.75mm bore and 9.0 compression ratio for improved engine performance.

Key Features

Fits Subaru WRX 2.5L engines.
Piston set includes four pistons.
Forged from 2618 aluminum for strength and durability.
Features a 99.75mm bore and 79mm stroke.
Designed for stock rod length (130.5mm) and 23mm wrist pins.
Includes a -14.1cc dish volume for a 9.0:1 compression ratio.

This piston set is designed for Subaru WRX 2.5L engines. Please verify compatibility with your specific vehicle's engine configuration.

⚠️ 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

Mahle's MS Piston Set is built with a boxed strut construction, a design choice that adds strength without adding excessive weight. This set is specifically for Subaru WRX models with the 2.5L engine, featuring a 99.75mm bore and a 79mm stroke, designed to work with stock-length rods and a 23mm wrist pin. The pistons are engineered with a -14.1cc dish volume, resulting in a 9.0:1 compression ratio when paired with the factory cylinder head. Each piston weighs in at 406 grams, contributing to a well-balanced rotating assembly.

These pistons are forged from 2618 aluminum, a material known for its durability and ability to withstand the higher temperatures and pressures found in performance applications. The 130.5mm rod length compatibility ensures a straightforward integration with your existing engine components. Mahle is a well-known name in engine building, and this piston set reflects their commitment to providing reliable parts for enthusiasts looking to rebuild or upgrade their Subaru's engine.

When rebuilding your engine, it's important to ensure all components are compatible and installed correctly. This set includes four pistons, ready for your machine shop to hone the cylinders to the precise 99.75mm bore. Please note that this part is not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.