SUBARU BOXER® Engine. Flat. Smooth. Smart.

Drawn from a century of intelligent performance, the horizontal layout of the SUBARU BOXER® engine combines balance with power and efficiency. And every Subaru comes with a SUBARU BOXER® engine.

Horizontal Design

Like the jabs of a boxer, where the engine got its name, the SUBARU BOXER® layout allows the engine to be positioned in-line with the drivetrain for maximum transfer of power. Many other engines are transverse, or turned perpendicular, and can require additional drivetrain components to transfer power, reducing vehicle efficiency.

The punch-counterpunch movements of the boxer's pistons cancel out each other for a smoother running engine without having to use additional components to counteract them as in many in-line and V-type engines.

Low Profile

With pistons moving horizontally, the SUBARU BOXER® engine has a flat, low profile, almost perfectly symmetrical, for a well-balanced vehicle. Its low profile can provide a lower center of gravity than other designs, helping provide quick handling response and flat, confident cornering.

SUBARU BOXER® Engine Options


There are different SUBARU BOXER® engines for the different styles of Subaru vehicles, tailored to the vehicle and meeting the performance requirements of customers' needs. But every engine is built from the same simple, efficient design.


2.0-liter and 2.5-liter Flat-4


Producing 148 and 170 horsepower respectively, these 4-cylinder engines combine capable power, impressive efficiency, and impeccably smooth operation.


2.5-liter Turbocharged Flat-4


Available in 227, 265, and 305-horsepower versions, this turbocharged, intercooled 4-cylinder engine provides maximum power for exhilarating performance.


3.6-liter Flat-6


The largest SUBARU BOXER® engine available, this 3.6-liter 6-cylinder serves up 256 horsepower and 247 lb.-ft. of torque.