Reinforcement plates from PLC are used to reinforce the frame in the area of the engine mount. This is where the two chassis areas, front frame and rear frame, converge. This area is particularly stressed on high-performance vehicles and can also tear during racing.
The PLC gusset plates stiffen this area and provide less torsion.
The plates are welded in place. Ideally, the first layer of sheet metal is drilled to achieve a continuous connection of all sheet metal layers.
Conclusion: Useful addition in racing as well as for strong street engines.