What should be done if the catalytic converter is replaced with a used one?

When replacing a catalytic converter with a used one, it is important to understand the regulations regarding emissions control systems. Installing a used catalytic converter can be viewed as tampering, especially if the used converter does not meet the specific emissions standards for the vehicle in question. Each vehicle is designed to operate with a specific type of catalytic converter that matches its emissions system, and using one that does not comply with these standards may lead to increased emissions and potential legal issues. Ensuring that emissions controls function adequately is crucial for environmental protection, and thus any alterations must adhere strictly to regulations to avoid being categorized as tampering.