Quote:
Originally Posted by whatfor90
I did not know that a catalitic converter would/could knock? Anyone have a sound clip?
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The internal catalyst , the "honeycomb" part, can get loose inside the metal housing of the converter. As the converter heats up, the exhaust pulses will rattle the catalyst and produce a knock that is akin to the sound of a plastic screw driver handle rapped against a steel tube. It is usually more noticeable in the garage or at a drive thru where the sound will be reflected back to the vehicle.
