The sixth generation Mustang was unveiled on December 5, 2013. The internal project code name is S-550.[67] Changes include a body widened by 1.5 inches and lowered 1.4 inches, a trapezoidal grille, and a 2.75-inch lower decklid, as well as new colors. The passenger volume is increased to 84.5 cubic feet, the wheelbase is still 8 ft. 11.1 in. (107.1 in.), and three engine options are available