Not dripping of oil is good. Not sure if there is a specific answer to the question. Given how important the MAF sensor is (for cars that are still using it), I would be inclined to run it through a clean and re-oil process. Yeah, total pita. Maybe call COBB and ask their thoughts?
Anyone else chime in? (and for the record I think it's a fail on COBBs part using an oiled filter when there are tons of proven results for the dry KN and AEM applications).