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Bilstein B1 (iRC) Active Suspension Control Module for 1999-2015 BMW 328i GX Optimize Rear Suspension Geometry onBilstein B1 (iRC) Active Suspension Control Module for the 1999 2015 BMW 328i 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. This