Original Rear bumper lower guard 3

A Rear Bumper Lower Guard is a protective and aerodynamic panel attached to the underside of the rear bumper. Commonly referred to as a rear valance, diffuser, or lower apron, its primary functions are to improve aerodynamic efficiency by managing airflow from beneath the vehicle, reducing drag and turbulence, and to protect the rear bumper, underbody components, and rear motor (if equipped) from road debris, stones, and minor impacts. For Tesla EVs, optimizing aerodynamics is directly linked to maximizing driving range. This panel is typically made from durable yet lightweight materials like ABS plastic, polyurethane, or, in performance versions, carbon fiber. It also plays a significant role in defining the vehicle's sporty rear aesthetic.