What is the compression ratio with these pistons?

These Mahle pistons have a -13.2cc dish volume, which results in an 11.8:1 compression ratio. This is a notable increase over stock and can contribute to improved engine performance.

Are these pistons suitable for a stock engine rebuild?

These are forged pistons designed for high-performance applications and an 11.8:1 compression ratio. While they can be used in a rebuild, it's recommended to consult with an engine builder to ensure they are the right choice for your specific build and to discuss necessary supporting modifications and tuning.

What does 'Not CARB approved' mean for shipping?

This means the pistons do not meet California Air Resources Board (CARB) emissions standards. As a result, they cannot be legally shipped to California.

Mahle 3.8L 99mm Bore Piston Set | 197846098

Name: Mahle MS Piston Set Por 997 3.8L 99mm Bore 82.8mm Strk 141.99mm Rod 22mm Pin -13.2cc 11.8CR Set of 6
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-por-997-3-8l-99mm-bore-82-8mm-strk-141-99mm-rod-22mm-p-t14-224469
Price: 1121.22 USD
Availability: BackOrder

Mahle MS Piston Set Por 997 3.8L 99mm Bore 82.8mm Strk 141.99mm Rod 22mm Pin -13.2cc 11.8CR Set of 6

$1121.22

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 Porsche 997 3.8L. Features 99mm bore and 82.8mm stroke for improved engine performance.

Key Features

This is a set of 6 Mahle MS forged pistons for Porsche 997 3.8L engines.
Features a 99mm bore and 82.8mm stroke with a 141.99mm rod length and 22mm pin.
The piston dish volume is -13.2cc, achieving an 11.8:1 compression ratio.
Forged construction offers improved strength and durability for high-performance applications.
Mahle is a well-known manufacturer of engine components.

⚠️ 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 Porsche 997 with the 3.8L engine, this Mahle MS Piston Set is a solid option. These are forged pistons, which means they're built to handle the stresses of a high-performance engine. Mahle is a well-known name in engine components, and this set is designed for a 99mm bore with an 82.8mm stroke, using a 141.99mm rod length and a 22mm pin. The dish volume is -13.2cc, resulting in a compression ratio of 11.8:1, which is a notable increase over stock and can lead to improved power output when paired with appropriate tuning.

This set includes six pistons, enough for a complete engine rebuild. The forged construction offers improved durability and strength compared to cast pistons, making them a good choice for engines that see spirited driving or track use. The precise machining and material selection by Mahle aim to ensure these pistons fit right and perform reliably. Remember that this piston set is not CARB approved and cannot be shipped to California. Always consult your mechanic or engine builder for specific installation requirements and recommended supporting modifications for your application.