Axle-Load front: Axle-Load rear: Lowering front: Lowering Rear: Ø front: Ørear: Adjustable front: Adjustable rear: Eibach Pro-Tronic Suspension Controllers A suspension control module for electronically controlled active suspensions. Eibach's EDC unit offers a literal suspension kit for the sporty driving style, adjusting the stiffness to bumps.