The Genuine BMW Alternator Air Duct is a high-quality, OEM replacement part for the BMW 525i, 528i, and 530i models. This air duct is designed to direct cool air to the alternator, helping to regulate its temperature and prevent overheating. It is made from durable materials and is an exact fit for the specified BMW models. This product is manufactured by BMW and is an authentic replacement part, ensuring the best performance and longevity for your vehicle. The part number for this air duct is 51118160855.