I have read here that some member's made some mod's to there factory air box's...I have a vent piece that belong's on a mazda truck..And the vent's will open and close..I am thinking about finding a place on my air box to install and i could control when to have it open or closed...But I am sceptical of would this help my motor run any better?...Would it really help the gas mileage any?....Thank's for your advice...Scott