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I've done it on a few bikes without removing the rear wheel.  But you cannot get the airbox out only lower it enough to get in there.  It's tight -- that's for sure.  But can def. be done.  The removal is required if you decide to drill a hole up top to drain the water like my dad did.  I decided not to drill mine and rather stuff rags in the sides under the seat when spraying with the hose and then using an air compressor to blow out the water.