WE have 2 BMW F650GS both fitted with K&N air filter. Had no problems at all with them. We had the same problems than Chuck (post above) at altitude (although the Dakar more than my standard GS) .
We cleaned the air filters in Cochabamba (Bolivia), did not fit the foam bit of the filter when we originally installed them in London and for altitude problems we replaced the oil with synthetic 10W40 . I know the manual tells you not to use synth.oil but this is doing fine for us. Still the Dakar is harder to start at 4000+m altitude but it´s much better than before.
Ha yes one thing and this is probably bad design from BMW, fitting the air filter in the Dakar is always a big Pain in the bum for some reason. Mines get in ok but the Dakar it is always tricky, the filter edge moves leaving a gap etc... Fiddly to get in....
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