I agreed with JIMD. Check you connection. When I took my air box out (we all know I like to take things apart for no reason), I did not put it back correctly. If you look at the photo and where the arrow is, well, on the opposite side (the underneath side) of that tube, there is a hook that if you do not connect it correctly will leave a gap underneath (which you cannot see). there are 2 tabs on each side, but there is a hook type at the bottom. Run your hand underneath and make sure there is no gap and you connected the tube securely. To be extra cautious, I would take it out again and just study the hook to understand how it is connected. Relax and just take it apart again and pay special attention to how each piece and the little hooks and groves on each piece and put it back carefully.