what is the box called that is in the engine bay on the passenger side on the framerail. it has a vacuum line and runs a line to the fuel tank.it looks like its in that bad of shape that it probably doesn't work, is it necessary? i just pulled my motor out last night and plan to clean up my engine bay. so i am looking for things to get rid of that i do not need. there is no smog or egr i deactivated both of those in my tune and got rid of both of them. it is not a daily driver so i dont care about the egr saving me gas.