What are the pros and cons of removing a car's catalytic converter?

[VonJasper]

Removing a car's catalytic converter has the advantage of increasing engine power, but the disadvantage of increasing fuel consumption. Removing the catalytic converter will have the following effects: 1. Pros of removal: After removing the catalytic converter, the engine breathes more smoothly. A significant portion of exhaust emission resistance comes from the catalytic converter. Without oxygen feedback regulation, this manifests as increased engine power and smoother vehicle acceleration. 2. Cons of removal: Typically, oxygen sensors are installed both before and after the catalytic converter. The front oxygen sensor reads higher oxygen levels than the rear. When the catalytic converter is removed, the rear oxygen sensor will detect excessively high oxygen concentration, indicating insufficient filtration. The electronic control unit will then interpret this as a lean fuel mixture, increasing fuel injection to enrich the mixture, thereby raising the car's fuel consumption.