The TB Mid Chassis Brace replaces the weaker stamped steel OEM brace. Yes - it’s nice to have. No - it’s not the most crucial one to get right off the bat. But - there are issues with aftermarket exhausts hitting the OEM mid brace on the FoST, so people end up just removing the OEM brace altogether. The TB Mid Chassis Brace will easily clear most 3” aftermarket exhausts, and it’s damn sure a huge improvement over removing your OEM brace.