...The springs address a key problem that hot hatchbacks with twist-beam rear suspension have always had; that, in order to effectively locate the rear axle and deliver top-level handling precision, you have to fit very rigid suspension mounting bushes that have a detrimental effect on ride sophistication.
These ‘torque vectoring’ springs, claims Ford, do as good a job as a Watt’s linkage in solving that problem, permitting the fitment of much softer ride bushes – and they’re also significantly lighter than a Watt’s linkage would be...