The side inner brace is a body reinforcement part that is bolted directly to the front side frame. It reinforces the suspension and engine mount parts, so it effectively prevents twisting, distortion, and other body twisting during acceleration, braking, cornering, and other movements in the car's behavior. It is a reinforcement part from the front monocoque to the engine room. It is attached to the door mounting hinge at the bottom of the A-pillar, and the inner brace reinforces the suspension mounting part. This part increases the rigidity of the front area, which greatly contributes to the twisting of the suspension and body. As a result, the tire's ground contact feeling is greatly improved, and the control performance is improved from braking to cornering, so you can feel it in your hands under any conditions, from the street to the circuit. It increases the body rigidity near the front suspension, improves the movement of the dampers and springs, improves the tire's ground contact performance, and improves handling performance. It is a body reinforcement part that can be easily installed with a bolt-on.
It is introduced on Ameblo's "M&M HONDA's Honda Honki."
https://ameblo.jp/mandm-honda/entry-11918994556.html