According to edmunds, for the 1999 Ford Mustang, Ford gives its sports car fresh styling and more motor. The 3.8-liter V6 engine makes 190 horsepower and 220 pound-feet of torque. The SOHC V8 found in GT models gets an 16-percent increase in horsepower. Improvements to the V6 and GT suspension and steering gear, as well as a styling update.
Ford gives the Mustang a makeover for its 35th birthday. An entire exterior redo includes revised front and rear clips, new taillamps and headlights; fresh door, hood, decklid and quarter panel sheetmetal; and redone rocker panel moldings, side scoops, and C-pillar appliques. The big news, however, is the under-skin changes that include engine output improvements, steering gear enhancements, and gains in rear suspension performance.
Download 1999 Ford Mustang Owners Manual