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Catalytic Converters

The catalytic converter is part of your vehicle’s exhaust system, but more importantly, it’s a key component of the emissions system, taking the Carbon Monoxide (CO), Hydrocarbons (HC), and Oxides of Nitrogen (NOx) created during combustion, and turning them into water, Carbon Dioxide (CO2) and Nitrogen (N2). The device is so named because it contains catalysts, substances that cause a chemical reaction without themselves undergoing chemical change.

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Catalytic converters have evolved since their inception, from 2-way converters to 3-way converters plus air, to the modern 3-way converter. In general a converter is composed of a cylindrical stainless steel enclosure housing a monolithic substrate which contains the catalyst. The most common catalyst materials are the precious metals platinum, palladium, and rhodium. Heat shields are attached to the outside of the converter to protect the undercarriage.

We aim to provide our customers with the finest Catalytic Converters the industry can offer, which is why we accept no compromise when it comes to the quality. Created by the most reputable names in the industry, such as Walker, Dorman, Bosal, Eastern Catalytic, Genuine the Catalytic Converters we've gathered for you feature precise design and everlasting durability.


The substrate in the converter is constructed to expose as much exhaust gas as possible to the catalyst as it flows through the converter, for maximum conversion and efficiency. 2-way converters use platinum and palladium to oxidize CO and HC. 3-way converters were developed to reduce NOx as well as oxidize CO and HC. They have a front substrate coated with rhodium to reduce NOx, and a second substrate that oxidizes CO and HC with help from the additional oxygen supplied by the air pump. Modern 3-way converters use advanced chemistry to convert all 3 harmful gases without the need for additional oxygen.

Although catalytic converters were designed to last many thousands of miles, there are factors that can cause their failure. Internal problems like plugging or reduced conversion efficiency are nearly always caused by engine problems like misfire, a rich air/fuel mixture, coolant leaks, and oil burning. Misfires and excessive fuel can cause the converter to overheat and melt the substrate, while oil and antifreeze can coat the surface of the substrate, preventing catalyst exposure to the exhaust. In its location under the vehicle, the converter is also exposed to impact from road debris that could cause structural damage.

Regardless of the cause for catalytic converter malfunction and symptoms: Check Engine light on, loss of power, failed smog test, or physical damage, we can supply you with a replacement that will restore performance and make your vehicle emissions legal. We offer both direct fit and universal converters. A direct fit converter will fit and function the same as your factory converter, and bolt right in place in your exhaust system, while a universal converter will require pipe cutting and clamping or welding for attachment. We also offer converters for applications where the converter is part of the exhaust manifold.

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Replacement Catalytic Converters Reviews
Average rating: 4.5 4.7 - 118 reviews
| Posted by Renee | (Portland, TX)

I have a 2013 Genesis coupe, running an ark racing exhaust system and headers. Slapped a pair of these puppies on and the engine light was gone with a mile. Works perfect.

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