Mowers, lawn tractors usually have a foam or foam sock over paper filter which is great for keeping the dust out. KN filters let a lot of dust thru their filters which the oil soak doesn't catch. On the diesel forums I visit, newbies find out why their KN assisted turbos get 'dusted' and ruined. Guys on the track use them a lot but also do higher maintenance on the filtration than most do on their daily drivers. You get more air but the filtering is minimal.