lid

People showed me a clip on airfilter , and i was wondering if you runn it with out the lid like it sayed , what happend when watter gets in it , and if anyone has more info and pictures of one please share it , thanks

Ok my buddy just got K&N filters in his '87 banshee , I've got UNIs and he used to have UNIs and he says the K&Ns are better , so the point is , is should I keep my UNIs or get K&Ns , also if you know and good aftermarket box CLOSED lids it would help