The Rear Sway Bar Support Brace Kit for the BRZ/FR-S from Whiteline is designed to reduce flex and fatigue of the original sway bar mounting components and increase sway bar performance. The factory mounts were not designed for upgraded sway bars and can flex and fatigue over time. These Subaru BRZ/Scion FR-S braces are designed for the rear only and are highly recommended for those running upgraded sway bars, especially in competitive driving conditions.