The Powerflex USA Rear Subframe Rear Bushing Insert - PFR51423 is a high-quality aftermarket replacement part designed to improve the handling and stability of a vehicle's rear subframe. This insert is made from durable polyurethane material and is designed to fit into the existing rear subframe bushings, filling any gaps and reducing movement. This helps to eliminate unwanted flex and movement in the rear subframe, providing a more responsive and precise driving experience. The insert also helps to reduce noise and vibrations, making for a smoother and more comfortable ride. It is a direct fit for specific vehicle models and is a cost-effective solution for improving the overall performance of a vehicle's suspension system.