Demmit. I need a test track! Well and good. I would think it is fairly easy to increase drag on a sedan. Those look like they were using linear actuators with some kind of linkage. You could link these to steering position sensors/encoders and ECU and would automatically deploy when they sense steering activity or brake pedal being pressed. But I would question the benefit in low speed corners especially anything below 100km/h (63mph). Linear actuators don't come cheap.
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