This article, originally published on 10/10/2019 at 9:24 a.m. eastern, has been updated with further information from Mountune USA.

Ford's 2.3-liter Ecoboost inline-four has had its share of attention from the media. It's most well-known for the head gasket issue that plagued the Focus RS last year, which turned out to be incorrect parts installed at the factory. Despite what you may think about its durability, it looks as if the 2.3 can handle a whole bunch of power.

Mountune USA recently uploaded a video to YouTube showing a modified 2.3-liter Ecoboost laying down 684 horsepower and 566 lb-ft of torque on an engine dyno. That's more horsepower than a McLaren F1 or a Viper ACR, and just 23 horsepower off a new Charger Hellcat Widebody. The engine has a specific output of 297 horsepower per liter, which is over 100 horsepower per liter more than a Bugatti Chiron.

The engine is a version of the high-performance 2.3 block already offered by Mountune, which includes a forged crankshaft, connecting rods, and pistons. It also has improved ports and high-lift cams. The tuner mentions in the video description the engine is using a BorgWarner EFR 8374 turbo and E30 gasoline. A spokesperson from Mountune says this amount of power was achieved using a new high-pressure pump and larger injectors. The goal of the project was to extract more power without having to add port injection to the motor (therefore adding cost and complexity). The tuner claims this is the most powerful direct-injection four-cylinder ever built.

Mountune says its been developing this direct injection system for nearly a year, with several dyno sessions and on-track testing. The firm says the system will be available to customers in the near future, so if you're looking to get the absolute most out of your Ecoboost engine, you know who to call.

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