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Bilstein B1 (iRC) Active Suspension Control Module for 2015-2019 Audi A3 Quattro ISR Performance 1992 BMW 5 Series 535i/540iBilstein B1 (iRC) Active Suspension Control Module for the 2015 2019 Audi A3 Quattro converts Bilstein B16 (ridecontrol) Suspension Kit to a smart phone adjustable suspension system. This module works together with a smartphone app to allow the user to fine tune the parameters which controls the switching from Comfort to Sport on the electronic Dampers. An accelerometer built into the module provides the app with a graph of the g forces while driving.