AERO PARTS
FUNCTIONS & BENEFITS
The engineering and testing behind aero parts.
Development of STI AERO PARTS
STI Aero Parts incorporate technologies developed and refined through motorsports, delivering a balance of exceptional design and functional performance. Find out how they are developed.
Drawing directly on the expertise and creativity of engineers involved in motorsport, STI applies their insights to the development of Aero Parts designed for use on public roads.
A representative example of this is the rear wing. Through our pursuit of optimal aerodynamic performance for motorsport vehicles, we found that adopting a swan‑neck mounting structure increases rear downforce and contributes to greater high‑speed stability. This expertise led to the development of the swan‑neck‑type DRY CARBON REAR SPOILER designed for use on public roads.
The development process comprises many stages. It begins with product planning, followed by extensive analysis and detailed design. Prototypes are then produced and subjected to more than a year of evaluation testing—including snow testing, on‑road testing, and wind‑tunnel evaluations.
Only after these performance verifications are completed are STI Aero Parts finalized and made available to the public.
STI Aero Parts are developed in close collaboration with SUBARU’s design team, ensuring seamless integration with each model’s exterior while fully expressing the vehicle’s inherent performance. To achieve this harmony between design and function, every detail is refined with precision.
For example:
-The front under spoiler is engineered to ensure that the pedestrian protection airbag sensors do not trigger erroneously after installation.
-The intended functionality of SUBARU’s original sensor systems is fully retained.
-The design prevents unnecessary airflow from striking the tires directly.
-Airflow is carefully controlled to manage volume and pressure, preventing excess air from entering the wheel housings and maintaining a stable flow environment.
Many other fine adjustments are made with the same level of technical precision and attention to detail.
Blending a streamlined form with uncompromising functional performance—made possible only through STI’s unique approach to engineering—this is how Aero Parts designed exclusively for SUBARU come to life.
Aero parts for motorsport vehicles—such as those competing in SUPER GT and the Nürburgring 24‑Hour Race—are developed through the same rigorous process of design, analysis, and validation.
FORESTER with STI Aero Parts
With All Four Aero Parts
Without All Four Aero Parts
With All Four Aero Parts
Without All Four Aero Parts
Models equipped with all four STI Aero Parts
Ensures that airflow around the body remains smoothly streamlined, enhancing stable and confident drivability.
With Front Under Spoiler
Without Front Under Spoiler
With Front Under Spoiler
Without Front Under Spoiler
Models equipped with Front Under Spoiler
Downforce is generated behind the spoiler, enhancing the vehicle’s overall stability and tire grip.
With Side Under Spoiler
Without Side Under Spoiler
With Side Under Spoiler
Without Side Under Spoiler
Models equipped with Side Under Spoiler
Airflow striking the area in front of the rear wheels is reduced, creating a more uniform pressure distribution and improving straight‑line stability and steering response.
With Rear Side Under Spoiler
Without Rear Side Under Spoiler
With Rear Side Under Spoiler
Without Rear Side Under Spoiler
Models equipped with Rear Side Under Spoiler
The spoilers reduce turbulence around the rear wheels, enhancing stability at the rear of the vehicle.
With Roof Spoiler
Without Roof Spoiler
With Roof Spoiler
Without Roof Spoiler
Models equipped with Roof Spoiler
Controls airflow over the upper body to optimize turbulent flow behind the vehicle, reducing lift and improving tire contact for enhanced stability.
Making everyday driving safer
Even at speeds as low as 30 km/h on public roads, vehicles are subjected to significant aerodynamic forces. Equipping STI Aero Parts helps control and streamline airflow around the body, reducing lift, enhancing stability,
and giving the driver a more relaxed and effortless driving experience.
When a vehicle is less prone to wander, the need for subtle steering corrections—such as small additional inputs or constant adjustments—is greatly reduced.
This helps alleviate driver fatigue and, together with reduced roll and vibration, enhances overall ride comfort, giving all occupants a pleasant cabin environment even on long journeys.
A more comfortable driving experience means arriving at your destination feeling refreshed and ready to fully enjoy the activities that await. STI Aero Parts are also precisely shaped to minimize aerodynamic drag, with careful consideration given to improving fuel efficiency.
From the meticulously engineered lineup of STI Aero Parts, find the ones that fit your SUBARU perfectly and
enjoy a more comfortable and safer driving experience.
For details, please contact your local SUBARU dealership or an authorized SUBARU distributor.
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