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Koni FSDs are now branded as Koni Special ACTIVE dampers. These new products integrate the latest generation in dual-valve suspension technology originally pioneered in the KONI FSD line. Koni Special ACTIVE premium shock absorbers use dual-valves to offer superior handling without compromising ride quality. One set of valves control low-frequency body motions and roll during cornering and changing lanes while another set of valves dampen high frequency bumps like potholes and expansion joints.