Will the noise increase if the car's three-way catalytic converter is removed?

[AndrewFitz]

The car's three-way catalytic converter is generally made of honeycomb ceramics or metal mesh, which can play a certain role in noise reduction. This is mainly because high-temperature harmful gases stay in the catalytic device for a sufficient amount of time. Removing it will create a large exhaust space, allowing exhaust gases to quickly discharge into the atmosphere, which naturally increases engine noise. Below is relevant information: Car Three-Way Catalytic Converter: The car's three-way catalytic converter is the most important external purification device installed in the car's exhaust system. It converts harmful gases such as CO, HC, and NOx emitted from the car's exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions. Function: It promotes certain oxidation-reduction chemical reactions, where CO is oxidized into colorless, non-toxic carbon dioxide gas at high temperatures; HC compounds are oxidized into water and carbon dioxide at high temperatures; and NOx is reduced into nitrogen and oxygen. These three harmful gases are transformed into harmless gases, thereby purifying the car's exhaust.