The larger of Chevrolet's two compact cars expands model and engine choices for 2006. Cobalt offers sedans and coupes. It shares its basic design and 4-cyl powertrains with the Saturn Ion, though Cobalt coupes lack Ion's rear access doors. Both Cobalt body styles come in LS, LT, and new SS trim. Also new is the LTZ sedan. SS models have 171 hp, the SS Supercharged has 205; all other models have 145 hp. All come with a 5-speed manual transmission. A 4-speed automatic is standard on LTZ, optional on LS, LT, and SS. Traction control is available with automatic transmission. ABS is optional for LS models, standard otherwise. SS and Supercharged include rear disc brakes, uprated suspension, and sporty styling add-ons. Front side airbags and curtain side airbags are packaged as a single option. All Cobalts come with a 60/40 split folding rear seat. OnStar assistance is optional.