Double security by securing onto disc with chain (469382

Just bolt the stable and secure side struts

Piston diameter 18 mm

Curved bill

DNA Air Filters - Stage 2 Air Filter Cover for BMW R 18 20-23 Options:Air Filter Cover Double security by securing ontoThis 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)