Technically, yes, but doing so is highly inadvisable and can be dangerous. A catalytic converter serves an important function in reducing harmful emissions from a car's exhaust fumes. By removing the catalytic converter, you may be exposing yourself to dangerous levels of toxic gases such as carbon monoxide or nitrogen oxide. Additionally, driving without a catalytic converter can also lead to other issues such as decreased fuel efficiency, increased noise pollution, and decreased engine performance. It is therefore highly recommended that you do not drive a car without a properly functioning catalytic converter.