im thinking about making a cai for my car starting AT the maf sensor, until i get 400$ for the k&n. its going to be running to the wheel well. my problem is theres a tube coming into the air filter box. its about 1 inch thick and is right under the rad hose, and is going into the air box. i have no idea what this tube is for, or what it does and im scared to mess with it. can someone please tell me what this is, what it does, and what do i do about it please. its for a 2004 grand prix gtp comp g.