Sport coupes use the Mercedes star-grille instead of the bar-grille, plus their own double-elliptical headlights, a swooping roofline, and a shortened rear end with a functional spoiler that adds downforce on the rear tires at high speeds. Compared to the sedan, the sport coupe is seven inches shorter overall. In fact, not a single exterior panel is shared between the sedan and the sport coupe. Although the sport coupe is not as aerodynamic as the C-Class sedan, with a Cd of 0.29, it's still one of the slickest cars in the industry, and it looks twice as mean and twice as slick as the sedan, with nothing there that doesn't need to be there. The coupe's long doors make for easy ingress and egress, especially to the rear seats. Nice touches include turn signal repeaters built into the outside mirrors, and the extra pane of glass underneath the spoiler that enhances rearward vision. The standard ten-spoke alloy wheels are especially handsome.