Cusco Lower Side Member Power Braces Rear (Steel) Bracing for Cusco Power Brace Rear End Subaru BRZ Toyota 86 ZN6 Battle Garage Cusco Lower Lateral Stabilizer Bar Power Braces Rear (Steel Cusco Lower Member Bar Power Brace Rear (Steel) Bracing for Subaru Cusco Power Brace Rear Trunk Plus 2015+ WRX STI. Developed by chassis engineers based off the data logged directly from CUSCO motorsports research. The power brace strengthens chassis and minimizes body flex especially at cornering loads, enabling optimal suspension movement at the intended geometrically aligned state. Having the same effect as stitch welding a chassis, the Power Brace series are Bolt on design with some minor body piece (under cover interior etc) trimming and completely effective on all vehicle chassis no matter stock or highly modified. These bars are made and constructed by lightweight steel and engineered inside & out by using the state of the art chassis stress test simulation software by leading motorsports professionals. Rear Trunk, LHD model only Require to remove and cut trunk liner and floor cover