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Rear bumper diffusers are automotive accessories that are designed to improve the aerodynamics of the vehicle. These diffusers are typically installed on the rear bumper of the vehicle and feature a series of fins or wings that redirect the airflow coming from the bottom of the vehicle. The redirecting of the airflow helps to reduce the drag force acting on the car, which can result in improved fuel economy, performance, and handling.

Rear bumper diffusers come in a variety of shapes, sizes, and materials, and are often made from lightweight materials such as carbon fiber or fiberglass. They are typically installed by bolting them onto the underside of the rear bumper, and can be customized to match the aesthetic of the vehicle. Some rear bumper diffusers also feature built-in lighting, which can improve the visibility of the vehicle at night. Overall, rear bumper diffusers are a popular modification for car enthusiasts who are looking to improve the performance and look of their vehicle.