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The K&N drop-in replacement air filter for select 2006–2009 BMW 1, 3 and 5 Series models is a washable, reusable element designed to improve airflow and acceleration while providing effective filtration. Intended as a direct-fit replacement in compatible RK Series housings, it carries K&N's Million-Mile Limited Warranty and offers maintenance-friendly reusability compared with disposable filters.
K&N 06-09 BMW 135/335/535 Replacement Drop In Air Filter
