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KONI Special Active FSD Shock (Front Left) for 2006-2011 BMW 3 Series RWD (E90) 1200 Yellow Speed Racing Dynamic ProKONI Special Active shocks for the 2006 2011 BMW 3 Series RWD (E90) use KONI's patented Frequency Selective Damping (FSD) technology to deliver two damping curves in one fixed shock soft for low frequency road inputs (comfort) and firm for high frequency body motion (control). The result is a daily driver that feels composed without compromising ride quality. FSD reacts to the road, not to a driver setting, so there's nothing to adjust and nothing to