A part has fallen from the underside of my 2005 Honda Civic 5 door automatic. I think it may be the heat shield but I'm not sure as I'm no mechanic. It was from around the middle of the vehicle. Unfortunately it was also run over by the car behind so I need a replacement. I have 3 questions - 1) Is it the heat shield; 2) Will I cause any damage driving without this until I get a replacement? 3) How much is a replacement?