A hybrid model is a midyear addition to the 2007 Saturn Aura lineup. Aura bowed for 2007 as the first Saturn midsize car since the slow-selling 2000-2004 L-Series. Aura shares its basic design with the Chevrolet Malibu and the Pontiac G6. XE, uplevel XR, and hybrid Green Line models are offered. XE and XR have V6s of 224 and 252 horsepower, respectively. The Green Line teams a 4-cylinder gas engine with a battery powered electric motor for 164 hp. All models include ABS and traction control. An antiskid system is standard on XR and Green Line, unavailable on XE. Front side airbags and curtain side airbags are standard. So is OnStar assistance. Options include leather upholstery, power-adjustable pedals, sunroof, and a "panoramic" sunroof with a tilt-up front section and three rear-sliding panels.