The Hengst Air Filter (545i 550i 650i) - E728L is a high-quality air filter designed specifically for BMW 545i, 550i, and 650i models. This air filter is made by Hengst, a trusted manufacturer of automotive filters, and is designed to provide superior filtration and protection for your vehicle's engine. It is made with high-quality materials and advanced filtration technology to effectively remove dirt, dust, and other contaminants from the air before it enters your engine. This helps to improve engine performance, fuel efficiency, and overall engine longevity. The Hengst Air Filter (545i 550i 650i) - E728L is a direct replacement for the original air filter, making it easy to install and maintain. Keep your BMW running smoothly and efficiently with the Hengst Air Filter (545i 550i 650i) - E728L.