Cadillacs largest car saw a host of changes for 99 including available massaging front seats on dElegance and Concours models. Other improvements include an electronic suspension with StabiliTrak. This system is designed to aid control in fast turns by selectively applying the front brakes. It was standard on the Concours and optional on others. In midyear, a Golden Anniversary option was added that included special white paint, wood interior trim, and 2-tone leather upholstery. The DeVille line was all-new for the 2000 model year.