This trunk room gusset plate is effective as a reinforcement for the trunk area, which is a weak point of the 4-door body. It compensates for the lack of body rigidity, suppresses twisting and distortion of the body, improves the movement of the suspension, and allows smooth load transfer from side to side and front to back. This trunk room gusset plate is fixed with bolts between the interior and trunk room, which is a weak point of the 4DR's weak rigidity, and dramatically reduces the twisting and distortion of the body, and contributes to all aspects such as improving the characteristics of the suspension, brake stability, and ground contact during cornering. It is possible to install a rear seat even when using it on the street, so you can enjoy both functionality and family-friendliness. You can also install a rear seat on top of the trunk room gusset plate, so when you're done with circuit driving, you can just install the rear seat and go home. When you remove the rear seats while driving on a circuit, the shine of the aluminum material of this trunk room gusset plate comes into view, transforming the FD2 into a racing car, and the increased visibility and rigidity of the interior will surely set you apart from your rivals! This trunk room gusset plate is made from a 2mm thick aluminum plate, and has evenly spaced reinforcing ribs to give the plate strength.