It is illegal everywhere. They are covered by federal law. Taking it off won't make your car go any faster, if that's what you think, unless it's plugged, in which case you can buy an after market unit and weld it in.
The vehicle will fail the emissions test.
It will really mess up the fuel mileage,and driveability
A quality aftermarket catalytic converter will work fine as long as everything else is in good working order.
A catalytic converter's function is to filter most pollutants out of the exhaust so it probably wouldn't mess up the computer in the car or lower gas mileage. On an OBDII vehicle(post 1996) the computer watches the O2 sensors to monitor converter efficiency If the converter has failed(or is missing) the computer will adjust fuel ratios to try to compensate This can ruin economy,
Misfire on cylinder 3. Get it fixed asap so you don't mess up your catalytic converter.
Don't Mess with Texas was created in 1986.
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Don't Mess wit Texas was created on 1997-06-17.
If it is leaking oil excessively you probably shouldn't. If the leaking oil was to reach the catalytic converter the oil could catch fire. Not to mention that everywhere you park you will leave a mess and you will be adding oil constantly to the engine.
A plugged catalytic converter will cause reduced power, lower gas mileage, and in extremely conditions, the engine will not run. The exhaust system is just as important as the intake. If the exhaust cannot get out, as when the catalytic coverter is plugged, the engine cannot create the proper amount of vacuum to draw the air fuel mixture into the cylinders. The exhaust gas is mixed with the incoming air mixture so you get a loss of power. This condition will also mess with the O2 sensor as the catalytic converter will get extremely hot and cannot reduce emissions properly because of reduced surface area contact. If you can remove the converter, and shine a light through it, you should be able to see the light on the other side fairly clearly. If not, you likely have a plugged converter. If you see any type of melting of the converter material, the honeycomb structure inside the metal housing, change it. You may also need to look for engine problems that could cause the melting of the converter.
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