This is getting boring to say but there are really no major changes to the Mustang again this year. Increases in pricing, a few choices in wheels and trim. Floor mats and a cargo tie down option. Blah, blah blah. Is it no surprise then that sales continued to fall in 1991 with only 98,737 Mustangs sold. For context, this was the first time ever that the Mustang failed to sell more than 100,000 units in a year.