You should never have removed the Catalytic Converter. It is there to control emissions pollution.
Tamperiing in such as way as you did can cause the engine to malfunction and maybe even fail to start. This is because the engine modifies the air/fuel mixture based on data received from the oxygen sensors that are before and after the Catalytic Converter.
In addition, you will now be registering an error code that will prevent you from passing your State’s emissions test.
If you followed my suggestion before you removed it, by using high octane gas for one tankful as I explain in my article, you might have been able to clean out the plugged up converter. But since you removed it, it’s too late for that now. You need to have a new Catalytic Converter installed.