KONI Special Active FSD Shock (Rear) for 2015-2018 Mercedes-Benz C-Class (W205) 850i 5) are a performance upgrade

5) are a performance upgrade to OE Dampers designed to be paired with the OE factory spring

2009 Subaru Forester XT (SG/SH)

Bilstein B1 (iRC) Active Suspension Control Module for the 2007-2011 Mercedes-Benz CLS63 AMG converts Bilstein B16 (ridecontrol) Suspension Kit to a smart phone adjustable suspension system

2015 Mercedes-Benz A-Class AWD Sedan/Hatchback

KONI Special Active FSD Shock (Rear) for 2015-2018 Mercedes-Benz C-Class (W205) 850i 5) are a performance upgradeKONI Special Active shocks for the 2015 2018 Mercedes Benz C Class (W205) 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