For One RM FC3S Rigid Color

In mass-produced vehicles, there is a gap in the bolt hole at the joint between the body frame and the subframe (engine member) .

Due to the gaps in the bolt holes and the misalignment of the faces, the subframe is not firmly fixed to the body, so straightness is spoiled, and the fastening part is misaligned, making his handling unstable when cornering.

Therefore, by sandwiching a rigid color in this part, he increased the strength of fastening between the subframe and the body, and by centering the entire car, the original appearance of the car body = stability was overflowing, and it had rich straightness.

For FC3S, this is enough for one front and rear.