Having a brace can not hurt. Even if having a A 12 motor, under tight cornering you will flex that body. A more powerfull motor like an SR20 would make it flex even in straight line, just by the rotation tendency an engine has under load. But make no mistake, swift cornering flexes your frame/body, and a tower brace is insurance against losing precious energy in fighting the opposing forces that create flexing and torsion. Put that energy where it belongs, by installing a tower brace.