high end cars like mercedes,jag,porsche and such are worth about 180-210 usd
toyota,honda, subaru are worth about 150-180 usd
GM cats are worth 150 usd the ones that say AC on them the older Gm's with the beads instead of the honeycob are worth about 75 usd there are so many different typs of cats that it is hard to guess at what you have
dodge/chry from 45 to 80 usd
ford 20-50
diesel cats up to 10000 usd some contain up to 6 ounces of pgm's these are very large cats.
i'm looking for my website to give you up to date prices when i find it i'll post it,i'm doing this from memory and could be off on my prices a bit since last i looked plat was 2100 and ounce and now is 1850