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Old 12-07-2012, 12:09 PM   #4
Gnarly Adventurer
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Joined: Apr 2009
Oddometer: 368
As far as i know a 90S should have holes in the airbox. Just as the later R100 has. I have two bikes with a replacement K&N filter. An R60/6 and an R100RT. There is no performance gain with the round replacement filter. Form, fit and function are the same as the original paper filter. The gain is in the reduced maintenance and the saving on new paper filters.
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