Looks like my cat is gone, and I plan on getting a new one put on in the next few days. Since the Toyota dealer wants $1400, I'm going aftermarket. Several people I know have had bad luck with aftermarket cats not working with their emission system (not Toyotas), and I don't need that problem since I have my annual emissions inspection coming up next month. If anyone has put a cat on a 2000 Corolla that works ok, please let me know the manufacturer and model nr if you kept a record. I've been to a couple of muffler shops, and they say "should work" not "will work". Thanks.