Performance Air Filter for BMW 3 Series / 4SeriesHigh Efficiency Induction for BMW N20, B48, and N47 B47 Powerplants Who Its For: Engineered for BMW 3 Series and 4 Series owners running the N20, B48, or diesel platform N47 B47 engines who want to eliminate the "cork" in their factory intake system. The Symptom: The factory intake on your F30 or F32 is a compromise between cost effective filtration and strict noise reduction regulations. The OEM paper filter uses dense, restrictive fibers that create
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