Performance Air Filter for BMW X3/X4/X5/X6 DieselPrecision High Flow Induction for the BMW N57 Diesel Powerplant Who Its For: Engineered for BMW X Series owners running the N57 inline six diesel engine who want to maximize volumetric efficiency without compromising engine safety. The Symptom: The factory intake system on the N57D30 engine is designed around a thick, disposable paper element. While it meets basic filtration standards, it creates a significant pressure drop across the filter surface
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