I was driving to a friend's house in my '95 Pontiac Sunfire Saturday night when all of a sudden I heard a metallic scraping sound and my car got really loud. When I pulled over into a parking lot and looked under my car I saw what looked like a long metal pipe that was broken and was dragging along the street. I called my friend and he was able to temporarily put the pipe back up and I was able to get home safely. He thought it was a muffler pipe. I'm not sure. I'm a total idiot when it comes to cars. Does anyone know what this long pipe is and how much it would cost to fix it? I've already put a lot of money into this thing since I got it back in 2007.