To guarantee reliability, choose BMW part # 11721433818 Air Pump. It is also referred to as Secondary Air Injection Pump. This genuine part is built directly by BMW under very rigorous testing and developed using reliable materials to tolerate years of heavy use and present long-lasting performance. This part fits 1996-1998 318i, 1996-1999 318is, 1996-1999 318ti, 1996-1998 Z3.
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