Like its 2007 predecessor, this Superleggera model derives most of its performance enhancement the Lotus way, by "adding lightness" -- 158 pounds of it to be exact. Most of the savings came by replacing metal or heavier plastic parts with carbon-fiber ones, the most notable of which include the engine cover, rear wing, sill panels, rear diffuser, mirror housings, some underbody paneling, and the interior tunnel and door panels.