This complete mounting solution for the rear differential features polyurethane construction, replaces all 3 factory mounts and adds the 4th mount that Hyundai forgot to give us. As we all know the stock rubber mounts are very soft. This product is a direct fit for the stock mounts and provides superior mounting for the differential housing. Polyurethane construction provides near solid mounting while providing just enough cushion to reduce parts from breaking under aggressive driving conditions. You will notice some additional noise and vibration but the trade off will be well worth it. After installing you will have better power transfer to the rear of the car during acceleration, improved throttle transition, and a much more stable rear end. All of this contributes to a better high performance driving experience.