Subaru has even achieved outstanding drag coefficient values across all models – 5-door, 4-door, wagon and SUV alike – as a way of contributing to stable high-speed driving and lower fuel consumption by pursuing aerodynamics efficiency. 
Small details - often hidden from view or not immediately apparent - can have an influence on airflow around a car. For example, covers mounted underneath the frame at the front and along the side of the body smooth the flow of air beneath the car and further limit the generation of unwanted lift. Even components like light clusters and bumpers have an influence and Suburu refines the shapes of these with the aid of real and ‘virtual’ wind tunnel testing.
The WRX STI also generates impressive downforce with minimal drag via the large boot spoiler, while diffuser functions in the rear bumper help to rectify airflow underneath the vehicle. This maintains a constant balance in the way the front and rear tyres are in contact with the ground, resulting in stable high-speed driving. The benefits which these aerodynamic additions provide brings about greater driving confidence, which ultimately enhances driving enjoyment.

An AWD system for manual transmissions with a simple layout consisting of a centre differential and viscous LSD. A 50:50 front and rear torque distribution is set under normal conditions. This maximises traction and provides driving backed with stability. When the front or rear wheels slip and traction is lost, the viscous LSD maintains optimum torque distribution between the front and rear. It links the flexible gear shifting of the manual transmission to deliver sporty driving that always maximises the available traction.

An AWD system designed exclusively for 5-speed automatic transmission, E-5AT (with manual mode) models to provide aggressive, sporty driving with increased turning abilities all while retaining the fundamental driving stability offered by the Symmetrical AWD. An uneven 45:55 front and rear torque distribution has been set for the front and rear tyres. Sending greater torque to the rear wheels can reduce understeer, a trait that plagues 4WD vehicles, when cornering for smooth and agile handling. Torque distribution is controlled automatically up to an equal 50:50 front and rear to suit road surface conditions for both sporty driving and stability.

An AWD system developed exclusively for 4-speed automatic transmission, E-4AT (with manual mode) and Lineartronic models to maximise the reliable driving performance of AWD models under any driving conditions. The system usually distributes torque 60:40 front and rear. Sensors constantly monitor the vehicle's condition in areas such as changes in grip of the front and rear tyres or vehicle speed. The electronically controlled MP-T (Multi Plate Transfer) adjusts torque distribution to the front and rear tyres in real-time to suit driving conditions. This further increases the stability of the AWD system to deliver a safe and agile driving experience.

Dual AVCS*
(SUBARU BOXER 3.6-litre / 2.5-litre high-power turbo / New generation 2.0-/2.5-litre DOHC)

A system that continually changes the opening and closing timing of the intake and exhaust valves through a hydraulic mechanism. This increases combustion efficiency, improves fuel efficiency, delivers smooth torque from low engine speeds, and provides linear accelerator pedal response and acceleration.
i-AVLS (variable valve lift)
(SUBARU BOXER 2.5-litre SOHC)

A variable valve system that controls the amount of valve lift and opening angle, and ultimately the amount of air flowing into the combustion chamber. At low engine speeds, lift in the left and right valves is alternated to generate a swirling flow (transverse vortex), resulting in efficient combustion even with minimal air and fuel use. A high valve lift is used for both valves at high engine speeds to generate a tumble flow (longitudinal vortex) for a greater amount of intake air. The result is outstanding fuel efficiency and large amounts of usable torque.