KONI Special Active FSD Shock (Front) for 2017-2021 Audi A4/S4 AWD (49mm Clamp) M235i xDrive Gran Coupe 510 Part Name Torsion Bar

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HKS Hipermax S coilovers for the 2002-2007 Subaru WRX (GDA) are engineered for drivers who want genuine performance gains without giving up daily-driver comfort

TruHart StreetPlus Coilovers for the 2008-2014 Subaru WRX (GE) are an ideal solution for the budget-minded buyer looking for a solution to lower their vehicle while drastically improving the handling characteristics

KONI Special Active FSD Shock (Front) for 2017-2021 Audi A4/S4 AWD (49mm Clamp) M235i xDrive Gran Coupe 510 Part Name Torsion BarKONI Special Active shocks for the 2017 2021 Audi A4 AWD 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 wear out.