The Genuine BMW Sound Insulat. Splash Wall Upper Part - 51489113809 is a component designed to reduce noise and vibration in a BMW vehicle. It is specifically designed to fit the upper part of the splash wall, which is the area behind the engine and in front of the passenger compartment. This product is made from high-quality materials and is an authentic BMW part, ensuring a perfect fit and optimal performance. It helps to improve the overall driving experience by reducing unwanted noise and providing a more comfortable ride.