You never know what you're going to encounter on older Mustangs. We ran into fitment issues when the righthand H-pipe was off by an inch. At first, we thought we would have to return it or visit a muffler shop. However, Brant put us in touch with the manufacturer, who suggested we bend the pipe ourselves. We placed one side under our left foot and pulled up on the right side. It was an easy fix for a perfect fit.