Bake and cool cake. Ice cake sides, background areas, front windshield, mouth, side windows, small lightning bolts, headlights and wheel wells smooth. Pipe
tip 3 outlines on car, windows, mouth, headlights, hood, lightning bolts, number and tires. Pipe tip 3 dot eyes and rivets on hood; smooth with finger dipped in cornstarch. Pipe tip 16 lines on tires. Pipe tip 3 dot pupils; smooth. Cover car, lightning bolt and number with tip 16 stars. Pipe tip 3 outline muffler. Pipe tip 5 bead bottom border.