What to do with my old exhaust?

[TheProspector]

I recently upgraded and now have my secondary cats and muffler sitting around and just thought I'd poll others as to what you did with your old exhaust? I've read some hang onto them to put back on later. I know there are some metals in the cats (platinum for one) and I guess the parts could be useful to someone. Just trying to gauge... sell for recycling/scrap, Craigslist, anyone here want it?

Thanks for sharing your thoughts