Cusco Power Brace Subaru Crosstrek (2013 2017) Impreza WRX STi Sedan Cusco Power Brace Subaru Impreza WRX STi Sedan GDF (2004 2007) Front Cusco Rear Power Brace 2002 2007 WRX STI FastWRX.com Cusco Lower Side Member Bar Power Braces Rear (Steel) Bracing for Cusco Lower Cross Member Bar Power Brace Front (Steel) Bracing for. 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