John Graham wrote:
<snip>
I noticed that I have a rattle in the back end for a
> while after starting from cold that sounds like sheetmetal or tin.
<snip>

It's likely that the honeycomb inside the CAT is broken.  The little
pieces could even clog the muffler.

You'll have to get your own new bolts when you replace the CAT as they
don't come with the CAT or the gaskets.

Mike