You would wipe that cat out just about as soon as you put it on the car. These motors run on average 2% to 3% CO and between 300 and 600 ppm's of HC's(unburned gas) and thats with a good tune on mostly stock motor. The BAR in Cali had maximums for these cars at 5.5% CO and 650 ppm's of HC if I remember correctly, been a long time since mine needed to be smogged. Cats are not made to handle that kind of exhaust emissions. Not to mention they are performance killers, especially when they start to get plugged.