Cusco Rear Member Side Power Brace 2015 2021 Subaru WRX STI 2014 Cusco Front Member Power Brace Subaru WRX STI 2008 2014 692 492 FM Cusco Rear End Power Brace 2015 2021 Subaru WRX STI SubiSpeed Cusco Power Brace, Rear End, 2008 GH WRX STi Suspension Misc Cusco Front Side Power Brace Subaru STI 15+. 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.