How to Solve the Loud Noise After Hollowing Out the Catalytic Converter?

[MacRyder]

Solution for loud noise after hollowing out the catalytic converter: Replace with a new catalytic converter. Below is relevant information about the catalytic converter: 1. Composition: The catalytic converter mainly consists of asbestos fiber felt, purifying agent, carrier, and metals such as platinum, rhodium, and palladium. Among these, platinum, rhodium, and palladium are the primary catalysts in the catalytic converter, effectively reducing nitrogen oxides and particulate matter in the exhaust. 2. Function: The catalytic converter is installed as the most important external purification device in the automobile exhaust system. It converts harmful gases such as CO, HC, and NOx emitted from the vehicle's exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions.

[LaMarley]

My car also had its catalytic converter hollowed out before, and the noise was terrifyingly loud, like driving a tractor. This happens because removing the catalytic material increases the internal space of the exhaust system, amplifying the sound of airflow impact. Later, I had the original catalytic converter reinstalled at a repair shop, and the noise immediately decreased. If you don't want to spend a lot of money right now, you can also install a specialized muffler—it's not expensive but quite effective. Remember, hollowing out the converter not only creates noise but also pollutes the environment, and traffic police impose heavy fines if caught. Safety first, get it fixed ASAP.

[DeKaleb]

I've seen this issue many times. After hollowing out the catalytic converter, the smoother exhaust flow causes sound waves to bounce back, making the noise louder. A simple solution is to check if the exhaust pipe connections are loose—tightening the screws might reduce some noise. For a real fix, it's best to replace the catalytic converter or add a muffler pipe. Improper modifications can also affect engine lifespan, like causing oxygen sensor errors. If you're handy, you can try it yourself, but make sure to buy genuine parts and don't skimp on quality.

[AlexaLynn]

The increased noise after hollowing out the catalytic converter is due to the destruction of its internal structure, which eliminates exhaust damping. From an environmental perspective, this is a significant issue, and illegal modifications pose substantial hazards. I recommend directly restoring the original catalytic converter as the most reliable solution. Have it repaired at an authorized shop, and the noise problem will be resolved. Additionally, inspect the entire exhaust system to prevent leaks. Driving a noisy vehicle long-term can also disturb neighborhood relations.