Originally Posted by pbink
so no one's had a cat rattle on them?
If you cat is rattling then it a sign that you're running too lean of a condition(High Nox). Hence the reason the mounting pad inside the cat is melting off the honeycomb brick inside the cat which is why the cat has that rattling sound. It's tumbling all around the cat. Check camshaft timing and crank timing is within specs and not overtly advanced.