I noticed a rattling (when stationary/going slow), and when I looked under the car it looks like (what I think is called) the heat shield has dropped onto the exhaust, and is causing the racket. Has anyone else with an Avensis had this? I went to a local independent who recommended just removing it, but reading online the general consensus seems to be the manufacturer will have put it there for a reason, so it should be replaced.  I don't have the facilities to get under it myself and