The auto mechanic said it was the "flex tubing" leading to the exhaust and he would cut the tube and replace it for $200. I was hoping to find the part for that price (or cheaper) and do it myself but I want to make sure I am getting the right part. With my experience its the pipe that leads under the car right under the driver side seat and continues to the exhaust. Either the name of that piece or a diagram with labeled parts would help me out immensely!