The Bosch 5494WS Air Filter is engineered to provide optimal engine protection and performance for a range of BMW models, including the 328i, 325i, 323i, 323is, 325is, 325xi, 330i, 330xi, 330Ci, 330Ci, 525i, 530i, Z3, Z4, and X3. This high-quality air filter ensures that only clean air enters the engine, preventing contaminants from causing wear and tear. Its design features a high-velocity cellulose cured media with evenly spaced pleats, minimizing air resistance and allowing for increased airflow to the engine. The imported polyurethane foam seal offers elasticity and sealing performance, effectively protecting against water and heat. With a filtering efficiency of up to 99.5%, the Bosch 5494WS Air Filter not only safeguards the engine but also contributes to fuel savings by ensuring optimal combustion. This air filter is a direct replacement for OE numbers 13721730449 and 13721744869, making it a reliable choice for maintaining engine health and performance.