Admittedly way more was done to the Corvair apart from a front anti-roll bar. They also added a transverse leave spring in the rear suspension to compensate for camber changes in the swing axle design as well as being extra support for the softer coil springs already in place. For the 1965 model year, they completely changed the suspension geometry to fully independent without swing axles. The damage was already done, however. It's also important to note that the issues with the BMW i3 are partly caused by the public being more used to a front engined, FWD car. They simply don't understand that a rear engined, RWD car is going to pendulum far greater and much faster. The same issues were what helped damage the reputation of the Corvair.