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Originally Posted by Xotik H3
It does, but in my experience a Cat will clog, and choke exhaust flow through it. Not sure what would rattle... not saying it would not, just don't know what would case it to rattle. If you do a search for a cross view of the inside, there are no part to come loose on later cats, after the late 90's.
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MY right side CAT went out about a month ago. Before the light came on, I heard the rattle. Went under the truck and heard it coming from the right CAT. I knew it was shot! Within 15 min of hearing the rattle the check engine lamp came on. They can rattle when they go bad