The muffler is probably worthless but I would put the cats on eBay. I replaced a defective pre-cat/header from eBay for $120 for one cat with two O2 sensors. I paid the shipping which wasn't that much and was very happy with my purchase. It could make you a couple of hundred and make someone happy to have saved a bundle! Anyway, it costs you nothing but 10 minutes of your time.
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James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow!

Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?