Whiteline '16-'18 Ford Focus RS 26mm Front & 22mm Rear Sway Bar KitAs the name suggests their objective is to reduce sway, or body roll, and stabilise a vehicle under lateral (cornering) forces. Formula 1 cars still use sway bars along side the shocks and springs as it is the ONLY suspension component principally designed to control body roll. Unfortunately, many aftermarket spring manufacturers still design their lowered springs too hard, trying to control body roll when its the sway bars job. The fitting of bigger