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Amazon.com: Hiflo Air Filter for BMW R1150R Rockster 2002-2005 : Automotive
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K&N BM-0400 Replacement Air Filter
Amazon.com: K&N Engine Air Filter: High Performance, Premium, Powersport Air Filter: Fits 1993-2006 BMW (R1150R, R1150R Rockster, R850R, R1150GS, R1150RS, R1150RT, R1100R, and other select models) BM-0400 : Automotive