The Genuine BMW Sound Insulat. Bottom Sect. Of Bulkhead - 51487007648 is a high-quality sound insulation product designed specifically for BMW vehicles. It is designed to be installed on the bottom section of the bulkhead, which is the wall between the engine compartment and the passenger compartment. This product is made from durable materials and is designed to effectively reduce engine and road noise, providing a quieter and more comfortable driving experience. It is an authentic BMW product and is designed to fit perfectly on the bottom section of the bulkhead for optimal performance.