I took my 00 Honda Accord to the dealer. I was hearing a screaching sound that I thought may be the brakes. The dealer says the brakes are fine and the sound is being caused by the catalytic converter. I do hear a ‘rattle’ at times that sounds like it’s coming from the exhaust system but the screaching is more prevalent. I have never heard of the cat converter screaching. Any thoughts? Of course they want me to replace it, but I want to make sure I agree with their assessment. Thanks!