Don't even bother sending back your old cat to ZZP.... you can get more money usually by just goin to scrap yard and selling it as the cats have precious metals such as Platinum in them. I got $75 for mine, i went to one guy first, and he offered me 40, i didnt accept that of course, and then another place gave me 75 for it! I have heard you can get 100 for them on some occasions.