The BMW 3 series M- Sport front sway bar is firm & heavy relative to the softer front spring rates. At times the front sway-bar may overwhelm the front springs with heave when one-wheel bumps are struck mid corner with the outside front wheel loaded. The driver can feel the transverse lateral force of the sway-bar twisting & flexing across the front end of the vehicle. When the outside front wheel is really loaded up at greater speed, you not only feel the loss of independence of the front end, but you can see the front sway-bar pushing the inside front unloaded front mud-guard down limiting the chassis body roll.
The loss of independence in the front end is not a pleasant feeling for the driver when striking one-wheel bumps mid-corner. The stiffer sway-bar overwhelms the softer front springs, trading off independence for a flat cornering stance. The longitudinal heaving forces are not violent enough to through the BMW off-line mid-corner. It does upset the natural flow of the chassis when impacting one-wheel bumps with the loaded outside tyre. This issue may relate to owners who drive out in the country on rougher B-grade country roadways.
BMW may have alternatively gone for a stiffer front spring rate and smaller, lighter more flexible front sway bar. This would make the ride firmer all of the time, but added some independence when striking mid-corner bumps.
Or better still: BMW may have ditched the versatile front strut suspension for a double-wishbone front end akin to the larger brother 5 series. The BMW 5 series has a great reputation for striking that balance between ride comfort/handling balance. Double-Wishbone suspension does a better job of consistently keeping the tyre in contact with the roadway. It provides for more consistent negative camber, reducing tyre scrub as the chassis leans from side to side. A double-wishbone front end may have allowed BMW to have a smaller & lighter front sway-bar, allowing for greater independence for the front end of the 3 series. ...
The ZF 8-speed auto gearbox is not as compact as the earlier generation ZF 6-speed auto. This may explain why the transmission tunnel of the G20 3 series BMW is quite wide. ..
...creating a slightly offset seating position for the driver and front passenger.