Quote:
Originally Posted by CarJunkie
The stiffer front bar adds grip to the rear, so if it is the only change, the car's inherent understeer from the factory would be worse. I run significantly more camber up front, and square tire setup on track, and it is neutral at the limit mid corner with the M3 'vert front bar and stock rear bar.
Also if you like to DIY, keep in mind that changing the rear bar requires dripping the subframe. The front bar is easy to swap.
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I would not be surprised if the E93 M3 bar alone increased understeer; and is likely best paired with square tires to make the car more "neutral". I just think, from my research, that there isn't any better option for the rear bar than stock. My opinion is that adjusting roll stiffness at the rear should be done via means other than the sway bar.