Hi,
Here's my question... Where the tubes go into the upper air cleaner box, they are pretty open. In fact, there is about an eighth of an inch open around the paremeter of each tube. Obviously the air can get sucked in that way totally bypassing the whole filter. I would expect that that shouldn't be like that. Is it supposed to be air tight? I'm thinking that the PO put on an air box from a different model.