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I remeber the Honda Prelude with 4ws. That system was passive and used the lean of the body to turn the rear wheels. The handling was worse and the system was often defeated by owners seeking good performance.
I'd bet active systems need a *bigger* powersteering pump too as the rear would be all hydraulic unless it is done electric instead. Still higher loads.
This feature is only useful if a tighter turning radius is needed.
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