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KONI Special Active FSD Shock (Front) for 1998-2005 Mazda MX-5 Miata (NB) whiteline-suspension-trailing-arm-bushing Riaction coilovers for the 2014-2015KONI Special Active shocks for the 1998 2005 Mazda MX 5 Miata (NB) 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