After picking up my new-to-me 2002 GTS with 5400 miles on it, I've noticed a little rattle which seems to come from the passenger side floorboard/firewall. It only occurs intermittently, seems to change with RPM and only while the car is moving. The best way I can describe it is that it sounds like a thin piece of metal rattling against the frame or firewall. It isn't extremely loud, causing any other problems or anything else of that sort, but it just sounds like something is loose. So this week I had the car up on jack stands to clean the wheel wells and while under the car I found that the thin metal heat shields that cover the catalytic converter area seem to be what I would consider "unsecured" underneath on both sides of the car while bolted securely on top. Underneath the car the shields seem to have bolt holes and are bent in a way that seems like they would be bolted to something. The car has never had any exhaust work done, so I don't know why or when these would have ever been removed. Are these supposed to be mounted to the frame below the car or do they just hang down? The holes in the metal lead me to believe that they should be mounted bolted to something. Not the best angle, but here are a few pictures of the silver heat shield from the top and from the bottom. Thoughts? Thanks!