Vegas,
Yeah thats right 01 TTR250. I initially removed the snorkel completely, but then once I got a powerpipe (Staintune), they recommended cutting the snorkel down and at angles that give more direct flow to the air filter. Also drill 2 x 1'" holes in the filter access panel, about 2" above and to the right of the centre line of the panel. This, in conjunction with the snorkel mods seems to have given enough air flow without as much water and other crap reaching the filter. If he hasn't already purchased a power pipe, tell him to lash out and spend some $. The difference in power and improved sound is well worth it. He'll have to muck around with the jetting - float postion for a while to get it right.
Obee