040-6500 Foam Filter R1100GS, R1150GS washable, with pre-filter
044-0870 UNI Foam Air Filter, R1200GS / ADV / HP2, 2005-1013 (Oil Cooled)
Baja riders have long known that oiled foam filters provide the best protection from dust. And they can be cleaned on the road with a solvent, and re-used hundreds of times.
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