Nissan redesigns its best-selling car for 2007, giving it freshened styling, more standard safety features, and the company's first gas/electric hybrid model. Altima is 1 inch shorter in wheelbase and 2 inches shorter overall than the 2002-2006 generation. Base 2.5 and 2.5 S models return with a 175-hp 4-cyl engine. Also returning are 3.5 SE and 3.5 SL versions with a 270-hp V6. A 6-speed manual transmission is standard on all but the 3.5 SL. A continuously variable automatic transmission (CVT) is standard on the 3.5 SL and optional on all but the base 2.5. Altima Hybrids are sold only in California and northeastern states. They pair the 4-cyl engine and CVT with a battery-powered electric motor for 198 hp. The Hybrid can run on one or both of its power sources depending on driving conditions; no plug-in charging is necessary. All Altimas have 4-wheel disc brakes. ABS is standard on V6 and Hybrid models, optional on all others except the base 2.5. Previously optional front side airbags and curtain side airbags are standard on all. Traction control is standard on 3.5 models, unavailable on 2.5s. An antiskid system is an exclusive 3.5-model option. A navigation system is available and, for '07, includes a rearview camera. Among other options are leather upholstery and wireless cell phone link.