DNA Air Filters - Stage 2 Air Filter Cover for BMW R 18 20-23 Options:Air Filter Cover It will protect your frame

It will protect your frame and casings right down to the toe caps while including protection of connecting rod

This is usually what gets replaced in order to eliminate the oil leak

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DNA Air Filters - Stage 2 Air Filter Cover for BMW R 18 20-23 Options:Air Filter Cover It will protect your frameThis filter features DNAs Stage 2 kit eliminates the OEM intake snorkel of BMW model and offers higher performance and better intake sound. This Stage 2 kit is designed to replace the stock plastic air box intake cover. Combined with the R BM18CR20 01 (sold separately) will increase the Airflow, Filtering Efficiency, Power, Torque and Throttle response. The airflow of this new DNA Stage 2 combined ALWAYS with the DNA Stage 1 Air Filter (P BM18CR20 01)