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Mahle Forged Piston Set - 2.3L EcoBoost - Oversize 4032

Mahle Forged Piston Set - 2.3L EcoBoost - Oversize 4032


Regular price $866.77
Regular price $942.14 Sale price $866.77
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Mountune's extensive knowledge of the Ford EcoBoost engine coupled with broad motorsport experience provides the foundation for the ultimate 2.3L Ford EcoBoost forged piston. Engineered in-house by our motorsport division and manufactured exclusively by our partner Mahle Motorsports, the mountune Mahle forged piston set for the 2.3L Ford EcoBoost is a fully featured piston with many of the same upgrades we use in our professional motorsport engines.

Produced from modern 4032 lightweight alloy forgings for extreme duty, each piston features supported pin bosses to withstand the extreme conditions found in engines operating with high cylinder pressures. The layout of the piston has also been optimized with weight reduction in mind and reduced skirt profiles to minimize friction. The design also includes gas accumulator grooves developed during extensive testing and tailored for the EcoBoost engine. Careful consideration has been used in the "bowl" area of the piston to maintain Ford's original profile to ensure proper and efficient combustion.

Extreme duty 22.5mm internally tapered, short wrist pins are used to reduce pin flex and weight. Mountune connecting rods are recommended to ensure a matched set of components. As an added feature, Mahle's phosphate dry lubricant coating is used on the entire piston to reduce micro-welding and pin galling. Additionally, Mahle's Grafal skirt coating is used on the piston skirt to reduce cylinder wall friction reduction.

Hard anodized top ring grooves have been incorporated for increased durability and strength to withstand the high cylinder pressures of high-boost engines.

  • Gas nitrided top ring: Superior combustion sealing, strength, and wear.
  • Gas nitrided second ring: Superior strength and wear.
  • Motorsport grade piston pin locks ensure reliable operation.

Technical Specs

  • Bore 88.0mm (+0.5mm over OE Size)
  • Compression Ratio 9.5:1
  • 4032 Aluminum 


  • 4 Pistons
  • 4 Piston pins and 8 clips
  • 4 Piston ring sets


  • 2016-2018 Focus RS
  • 2015-2021 Mustang Ecoboost
  • Ford EcoBoost 2.3L Engines

Return Policy

You have 7 calendar days to return an item from the date you received it. To be eligible for a return, your item must be unused and in the same condition that you received it. Your item must be sealed in the original packaging. Your item needs to have a receipt or proof of purchase. Some exclusions apply.

For additional details see our Return & Refund Policy.

Installation Guides

To see all available installation and break-in instructions, click here.

Disclaimers & Legal

This part has been designed and is intended for off-highway application only. Installation of this part on a vehicle that is driven on public roads may violate U.S. and Canadian laws and regulations relating to emission requirements and motor vehicle safety standards.

Click Here for emissions compliance information.

California Residents Prop 65 Information
California’s Proposition 65 entitles California consumers to special warnings for products that contain chemicals known to the state of California to cause cancer and birth defects or other reproductive harm if those products expose consumers to such chemicals above certain threshold levels. This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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