How Do I Know If My Catalytic Converter is Aftermarket?
Posted: April 25, 2025
Here are the things to look for when identifying Aftermarket Catalytic Converters. We are regularly asked how to tell the difference between aftermarket and OEM catalytic converters. Have you asked yourself, “How do I tell if I have an aftermarket cat?”. Hopefully, we can help answer your question.
How do you know if you have an aftermarket catalytic converter?
There will be common codes with “N” on the units, along with a silver-colored shield with an arrow. Occasionally, the word “Flow” or “Out” will also be stamped on the aftermarket catalytic converter.
Common Characteristics of an Aftermarket Catalytic Converter:
- Silver Shield
- Arrow on Shield
- Serial Numbers Starting with “N”
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Aftermarket parts manufacturers aren’t held to the same standards, though some requirements were stiffened in 2009. Therefore, the precious metal content in aftermarket catalytic converters is often much less than that of the original factory equipment. The lower precious metal content means the aftermarket converter holds less value than an original manufacturer’s unit when you sell it for scrap metal.
An easy way to identify aftermarket versus OEM converters is through appearance.
If the catalytic converter has a silver metal casing with an arrow on it, that typically means it is aftermarket. The arrow indicates the proper installation direction based on airflow.
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Common Letters on Aftermarket Catalytic Converters:
- NT, NAT, NCE, NGE
- Makers: NCE, Bosal, MagnaFlow
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