Subaru WRX STI (2015-2021) Rear Diffuser V7

Improve the aerodynamics of your Subaru WRX STI (2015-2021) with the AeroflowDynamics Rear Diffuser V7. This sleek and functional addition decreases drag and improves downforce, ultimately enhancing your vehicle's performance and handling. Easy to install, it's the perfect upgrade for any Subaru enthusiast. A rear diffuser is an automotive aerodynamic modification typically found mounted on the vehicle’s underbody located at the rear of the car, underneath the rear bumper. As a vehicle is in motion, air flowing in the underbody is typically at high-speed and has low-pressure. The design and purpose of a diffuser are to help reduce drag and to create downforce by facilitating the airflow underneath the vehicle’s underbody. A diffuser is used to increase the air volume along its full length, thus creating a void that must be filled by air. This in turn creates a Venturi effect, meaning the air flow is accelerated at the beginning of the diffuser creating a low pressure, thus creating dow