The Genuine BMW Sound Insulation Subwoofer Left (part number 51487039407) is a high-quality sound insulation component designed specifically for BMW vehicles. It is made from durable materials to effectively reduce noise and vibrations from the subwoofer, resulting in a clearer and more enjoyable audio experience for the driver and passengers. This product is an authentic BMW part and is compatible with various BMW models. It is a left side component and is easy to install, making it a convenient and effective solution for improving the sound quality in your BMW.