Rather than altering the bottom height of the car like a lower lip, these aerodynamic inserts snap cleanly into the factory lower bumper recesses and side air curtain dams. Sourcing them in autoclave-baked 100% Prepreg (Dry) Carbon Fiber ensures the panels are razor-thin, structurally rigid against high-velocity airflow, and perfectly match the 2×2 twill weave pattern found on factory M Performance composite elements.