I have a 347 in my 91 Fox and I just installed upper and lower control arms. I didn't put the rear swaybar back in. My car certainly does not feel like it's going to flip, lol! If anything it's more balanced and less prone to fishtail all over the place. If you have a little power, I would remove it unless you love to road race or autocross. For the street or strip, I like it much better. It's also a smoother ride back there.