Design a photorealistic, sleek sports car with a vibrant orange exterior and unique upward-opening doors. The car should feature a prominent angular front with sharp headlights and a streamlined aerodynamic shape. Also, design a secondary vehicle with a matte silver exterior, an aggressive front grille, and wider wheel arches. No brand references should be included. Both vehicles should be placed in a modern racetrack environment with a blurred background to emphasize their speed. Enhance the scene with an overcast sky for dramatic effect.