With plenty of room inside and a clean, attractive design, the 2006 Chevrolet Impala should build upon its history as one of GM’s best selling vehicles. The 2006 Chevrolet Impala SS is a family-sized sport sedan equipped with a sport-tuned suspension and performance tires, standard OnStar telematics, side-curtain airbags and a 303-horsepower V8 engine that cuts operation of half the cylinders during cruising speeds to save fuel.