If you intend to ride much mud/water aside from snorkels your best and cheapest mod would be to re-route your crank vent up to your handelbars. Pull it from the airbox, plug the hole with silicon, use a connector and few feet of hose (forget the diameter) run it up under the plastic cover for the handlebars and fit a one way pcv valve in the end. Next time you drown it you won't have to change your oil and all the dirty water that floods your airbox will not drain down to your crank and act like sandpaper on your bearings. Will extend the life of your motor greatly and for $15 is much cheaper than oil and filters every time (I figured this out after about the 25th drowning and one toasted motor later!), unless of course you need to justify an 840bbk to your wife:d