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The K&N High-Flow drop-in air filter for BMW 540i (1997–1999) is a washable, reusable replacement element engineered to increase airflow and provide long-term engine protection. K&N filters use layered, oiled cotton media to capture contaminants while improving breathing and are designed to install directly into the factory air box. Each filter is reusable and covered by K&N's long-term warranty policy.
K&N 97-99 BMW 540I Drop In Air Filter
