Anyone know what used cats are worth. I was going to just scrap them but I just saw a stock Mustang H-pipe sell on eBay for 175 dollars. I have all three.

$50.00 for one that is intact, if you bring them to the right place. larger ones for trucks & vans can go for over $100.00

I just turned in two full sets of Mark cats, I got $55 per, or $165 for all three.

good money if you can get ahold of some.

Where do you sell them?

http://www.adolphsconverters.com/

I sold the 2 pre-cats and 2 actual cats from a 98 V6 Mustang for $180 on eBay... They will bring decent money.