* Illegality: Removing a catalytic converter is a violation of environmental regulations in most countries. You'll face significant fines if caught.
* Environmental damage: Catalytic converters reduce harmful emissions like carbon monoxide, hydrocarbons, and nitrogen oxides. Without one, your car will release significantly more pollutants into the atmosphere, contributing to air pollution and harming the environment.
* Potential engine damage: While the car might run, the lack of a catalytic converter can, in some cases, lead to engine damage over time due to the increased backpressure on the exhaust system. This is because the catalytic converter is also part of the exhaust system's backpressure management.
* Failed emissions tests: Your car will almost certainly fail any emissions test required for registration or inspection.
In short, while technically possible, driving without a catalytic converter is illegal, environmentally irresponsible, and potentially damaging to your vehicle.