Chevrolet revises the 2006 Cobalt lineup, ditching the Base trim in favor of LS, LT sedan, and a new premium LTZ version (sedan only) for the volume models. Also new this year are SS coupes and SS sedans with a 171-horsepower, 2.4-liter four-cylinder engine under the hood, special exterior trim, 17-inch wheels, four-wheel-disc antilock brakes, and performance suspension tuning. The hot SS Supercharged coupe from last year returns for 2006. Majestic Amethyst and Laser Blue are the new colors this year.