Hey I took out the top part of my airbox because I was thinking of buying a cone filter. I saw a second filter in the top part of the airbox. It says "do not remove" so of course i removed it. So I still have the factory air filter in there but took out the smaller filter. I had to drill it to get it out. Its been out about 3 days now, in dash mpg went up about 3 mpg since i reset it and no CEL lit up on dash so everything is good. Did anyone else do this??