Nissan scrutinized every ounce of the 370Z. Weight was reduced by changing the rear hatch and doors to ultra-strong lightweight aluminum. Additionally, 3.5 lbs. were shaved from the audio system. High-tech materials include a carbon-fiber composite driveshaft that is not only incredibly strong, but also helps the engine rev more quickly, as well as a weight-saving carbon-fiber composite radiator support structure. More power. Less weight.