i thought about removing the airbox lid as well, but i read somewhere about the sound increase so didn't go with it. also read that the factory air box has space for pretty good circulation, so having it off won't do much. don't remember where i read it from though..
current: Black 2013 Focus Titanium Hatchback
previous: 2007 Mazda3 Sport Axela | 2000 Honda Civic LX