That's an intriguing question. On one side is the fact that Chrysler [ or any other manufacturer for that matter ] never spent the money to put a part on a car if they didn't think it was necessary. At the same time they didn't put them on manual trasmission cars which were subjected to higher shock loads. All I can say is that lots of people with headers do without one or both braces and they don't appear to have any problems that can be attributed to the lack of a brace[s]. FWIW when I had my old Duster with a 727 and TTI headers I modified the factory brace to fit. Pretty sure it was the right side brace that I altered.