If it's already rattling the honeycomb is already broken so the cat
isn't really doing its job.  The worst case is that the broken pieces
continue to break into pieces small enough to clog the cat and/or
muffler causing big problems.

As a quick fix ... until you can replace the cat with a good one ... you
can remove it and poke all the honeycomb out of it so that its
essentially a straight pipe (hollow) and put it back on.  At least this
way you avoid the possibility of clogging.

Mike

Richards, Andrew wrote:
> All,
>
>
>
> My catalytic converter sounds like a coffee can with a couple nuts
> rattling around inside.  Is there a cheap man's solution to quieting it
> up?  I once had an old Subaru with double walled exhaust that I ran a
> sheet metal screw into to secure the inner pipe.  Would something
> similar work here?  I just don't have the cash to buy a new one right
> now.
>
>
>
> Thanks,
>
> Andrew
>
> '87 GL
>
>
>