I didn't think these were under carriage protectors but streamlining devices
From the My 23 Brochure...
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While the aerodynamic aspects of the silhouette are plain to see, the Stinger also boasts vital drag reduction features that improve airflow underneath the car. It uses specially designed undercovers, below the engine and transmission, each side of the cabin and each side of the rear suspension. These covers reduce the air flow resistance on the underside of the body when travelling at higher speeds""
From the My 23 Brochure...
""
Aerodynamics
While the aerodynamic aspects of the silhouette are plain to see, the Stinger also boasts vital drag reduction features that improve airflow underneath the car. It uses specially designed undercovers, below the engine and transmission, each side of the cabin and each side of the rear suspension. These covers reduce the air flow resistance on the underside of the body when travelling at higher speeds""