We see a lot of Mustangs in our shop! We have seen the rear alignment off from the factory..it's crazy but it happens. The stock bars are either cut too short or too long, or they are just fine. Its a small amount of cars but they still exist. The BMR Pan-hard Bar is not expensive and it really wouldn't hurt any Mustang to have one since most people modify their suspension at some point. They have polyurethane bushings too so there is less bushing deflection in the corners as opposed to the factory rubber bushings. Its also a good time to get some BMR Lower Control Arms as well, both of these combined are under $300 and you will notice the difference and your car will get better traction.