I managed to make a outer collar that is about 30mm tall ( I would post pics if the site would let me) This should keep the filter dry unless I try and use the bike like a jet ski. Even though the design in my oppinion is poor compared to most dirt bikes I have owned( horizontal mounted as opposed to vertical) there does seem to be a fair volume in the airbox to cope with water entry, just as long as you remember to drain the tube after. I have to admit watching my bike taken up to the redline on the Dyno did make me wince a tad but sometimes you have got to take one for the team, hope other people can benefit from the results