Sound dampening material is key to reducing the rattles and shakes in your car. It reduces the amount of road noise coming through the thin panels of your vehicle and does so effectively. It also lessens vibrations created by playing music through your speakers. By adding weight to the panel where it's installed, it lowers the resonating frequency. By adding this material to your car, your sound system will likely get noticeably louder. If you have subwoofers, this is the perfect kit for your vehicle.