This video may help you.
https://www.youtube.com/watch?v=OO03n22rwfg https://www.youtube.com/watch?v=ZFeNsMBJl8M
SOURCE: 03 Mountaineer AWD Premier V8 rattling noise under vehicle
If its the heat shield against the underside.its install with fender style aluminum rivets( if you do it be very careful not to drill into a harness) If its the heat shield around the CAT then you should replace the cat. You can try to repair it with a pair of long hose clamps but I don't advise removing it. In the wrong environment the heat could cause a grass fire. or ignite trash that may get caught or blown underneath. Good luck.
SOURCE: need to replace catalytic converter heat shield
I just took mine off to keep it from rattling, and bought a heat resistant header tape and placed the tape right over the Catalytic Converter on the body it self. Good luck and keep me posted if you have any more questions.
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