What is the reason for the increased noise after installing an aftermarket catalytic converter?

[JaceDella]

After replacing the catalytic converter with an aftermarket one, the increased noise during acceleration is due to the poor quality of the catalytic converter. Here is some information about catalytic converters: 1. Once the catalytic converter is damaged, the most obvious symptom is a very pungent odor from the exhaust, as harmful substances like sulfur dioxide cannot be filtered. Most importantly, this causes irreversible pollution to the air. Therefore, if any abnormalities are noticed, the catalytic converter should be inspected promptly to determine whether it is clogged or damaged. 2. For vehicles driven in urban areas, due to poor fuel quality and traffic congestion, the lifespan of the catalytic converter tends to be shorter, and it is prone to clogging. These issues can directly affect the proper functioning of the oxygen sensor, leading to inaccurate control of fuel injection, air intake, and ignition, which in turn increases fuel consumption.