I've dumped my SE in water. Not very deep. Silly, silly thing it was, went to dab, but caught my pants on the footpeg. But I got it up again, and I didnt even bother looking - I knew there was no way water could have gotten past the airbox, let alone the air filter...
Its the one concern I have in ditching the airbox... I guess I will just steer clear of water
Shame kamanya, not much luck, dumping in water AND having your Li battery crap out on you.