Im thinking of adding a uni pre filter to my 06 990. The one that replaces the snorkle. But I dont want it to make it run any leaner wich adding another filter may do. So it got me thinking. Could I just run the pre filter as the only filter. I would run a replacable/washable sock on it. The main filter in the airbox I would cut out the filter material and leave the rubber frame. This would give me a filter that is real easy to access and the carbs would be kept in a clean box. Has anyone running a prefilter found their main filter still gets dirty ?