What would be the best catalytic converter to get to put on a stock 2000 trans am ws6?? And does anybody else know, with catalytic converter and straight pipes will the car still pass emissions?

 

There are two cats and they're covered under warranty for 10 years/120K if you're keeping the car stock. Can't help you on emissions, don't have any here in Florida. Some states just have the sniffer, some OBDII check, some visual and/or a combination.