I just opened up my son's 2001 TTR90 to get an idea of where the snorkel is and what I'm gonna have to do to do the airbox mod. I followed the balck tube from the carb to under the tank. There is no airbox....the black hose just ends right under the frame bar(under the tank)!BTW: it looks stock and isn't 'cut off' or anything. Is this normal? I live in NY...do we get a different setup up here that doesn't require an airbox??