What is the thing attached to the bottom of the car directly under the spare tire? I believe that it has something to do with the gas tank. Is this thing really needed or can I just connect the hoses together and take it completely off? I know a good deal about motorcycles and I think this thing is similar to an EVAP canister on motorcycles. Its usually not needed. Any thoughts, suggestions. I'm just asking because its right in the way of my audio setup. Those extra 3 inches under there would be great.