These should be replaced, not straightened, once they have deformed — a straightened bar will not behave the same way twice, and the mounting points on the rail are usually what moved.
Reinforcement bars, impact beams, apron panels and reinforced sections carry load in a collision. They should be replaced rather than straightened once deformed — a straightened bar will not behave the same way twice, and the mounting points on the body rail are usually what moved.
