Originally Posted by Richbot
Single best thing you can do to improve balance on a street BMW is add more front camber. The best way to do this, counterintuitively, is often to add a stiffer front swaybar to keep the front suspension in its happy place, because the front suspension geometry de-cambers the tire as it travels through its range of motion in bump. The E90 chassis is much better than past designs in this regard but still not as good as some double wishbone setups which can get by with less than a degree of negative camber and still keep the tire square to the road in a corner. A bigger rear bar just takes grip away from the rear especially under acceleration, what the car needs is more front grip
I though most would disagree to replace the front sway vs the Rear...