The catalytic converter is part of your vehicle’s exhaust system, but more importantly, it’s also a key component of the emissions system. The catalytic converter takes the Carbon Monoxide (CO), Hydrocarbons (HC), and Oxides of Nitrogen (NOx) created during combustion, and turns 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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    • (0 reviews)
      # sp4302
      Exhaust Manifold with Integrated Catalytic Converter by Walker®. Walker offers complete coverage: direct-fit mufflers, converters, pipes, resonators and accessories. Walker is an OE supplier to many major nameplate vehicle...
      Flange to flange, direct fit design bolts to existing exhaust5 Year / 50,000 Miles Warranty on Structural Components
      $253.28
    • (0 reviews)
      # sp106310
      CalCat™ Exhaust Manifold with Integrated Catalytic Converter by Walker®. Walker offers complete coverage: direct-fit mufflers, converters, pipes, resonators and accessories. Walker is an OE supplier to many major nameplate...
      Constructed to meet your vehicle’s specific emissions requirementsDirect fit design
      $156.80 - $804.87
    • (0 reviews)
      # sp106556
      ECO GM Stainless Steel Exhaust Manifold with Integrated Catalytic Converter by Eastern®. If you need to replace your failed or damaged manifold, this product is the right choice. Designed specifically for your vehicle, this...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $162.79 - $424.56
    • (0 reviews)
      # sp106567
      Standard Stainless Steel Exhaust Manifold with Integrated Catalytic Converter by Eastern®. If you need to replace your failed or damaged manifold, this product is the right choice. Designed specifically for your vehicle, this...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $285.30 - $635.95
    • (0 reviews)
      # sp106558
      ECO III Stainless Steel Exhaust Manifold with Integrated Catalytic Converter by Eastern®. If you need to replace your failed or damaged manifold, this product is the right choice. Designed specifically for your vehicle, this...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $212.20 - $646.59
    • (2 reviews)
      # sp21032
      Manifold with Integrated Catalytic Converter by Eastern®. If you need to replace your failed or damaged manifold, this product is the right choice. Designed specifically for your vehicle, this manifold with integrated catalytic...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $228.28 - $618.61
    • (0 reviews)
      # sp106554
      ECO CARB TWC Exhaust Manifold with Integrated Catalytic Converter by Eastern®. If you need to replace your failed or damaged manifold, this product is the right choice. Designed specifically for your vehicle, this manifold with...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $519.33 - $554.75
    • (0 reviews)
      # sp106557
      ECO II Stainless Steel Exhaust Manifold with Integrated Catalytic Converter by Eastern®. If you need to replace your failed or damaged manifold, this product is the right choice. Designed specifically for your vehicle, this...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $228.09 - $690.80
    • (0 reviews)
      # sp106550
      ECO CARB Exhaust Manifold with Integrated Catalytic Converter by Eastern®. If you need to replace your failed or damaged manifold, this product is the right choice. Designed specifically for your vehicle, this manifold with...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $249.06 - $802.94
    • (0 reviews)
      # sp106555
      ECO CARB WU-TWC Exhaust Manifold with Integrated Catalytic Converter by Eastern®. If you need to replace your failed or damaged manifold, this product is the right choice. Designed specifically for your vehicle, this manifold with...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $324.09 - $600.71
    • (0 reviews)
      # sp106553
      ECO CARB Stainless Steel Exhaust Manifold with Integrated Catalytic Converter by Eastern®. If you need to replace your failed or damaged manifold, this product is the right choice. Designed specifically for your vehicle, this...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $234.32 - $355.87
    • (0 reviews)
      # sp103492
      Stainless Steel Exhaust Manifold with Integrated Federal Catalytic Converter by AP Exhaust®. Catalytic Converter Substrate Material: Ceramic. Converter Body Material: Stainless Steel. Catalytic Converter Overall Length: 17.75""....
      Manufactured from high quality materialsDesign meet needs of OBDII equipped vehicles
      $246.69 - $739.78
    • (0 reviews)
      # sp106607
      Standard Load Exhaust Manifold with Integrated Catalytic Converter by Bosal®. If you’re in need of a replacement catalytic converter, you can’t do better than Bosal. They’re a leading supplier to vehicle manufacturers and use...
      Constructed to meet your vehicle’s specific emissions requirementsRadial flow concept allows for an even distribution of the gas flow in the converter for the optimal conversion of harmful gases
      $299.75
    • (0 reviews)
      # sp106606
      Premium Load Exhaust Manifold with Integrated Catalytic Converter by Bosal®. If you’re in need of a replacement catalytic converter, you can’t do better than Bosal. They’re a leading supplier to vehicle manufacturers and use...
      Constructed to meet your vehicle’s specific emissions requirementsRadial flow concept allows for an even distribution of the gas flow in the converter for the optimal conversion of harmful gases
      $307.06 - $379.97
    • (2 reviews)
      # sp20037
      Manifold with Integrated Catalytic Converter by Bosal®. Converter Configuration: Direct Fit. Catalytic Series: Premium Load. CARB Compliant: No. If you’re in need of a replacement catalytic converter, you can’t do better than...
      Constructed to meet your vehicle’s specific emissions requirementsRadial flow concept allows for an even distribution of the gas flow in the converter for the optimal conversion of harmful gases
      $175.90 - $552.31
    • (2 reviews)
      # sp95244
      Exhaust Manifold With Integrated Catalytic Converters by Dorman®. More like a complete kit than a single part, many of the Exhaust Manifolds include gaskets and hardware for a complete installation. Since this part is a direct...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $161.90 - $971.94
    • (0 reviews)
      # mpn615929492
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $384.13
    • (0 reviews)
      # mpn2263352759
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $398.41
    • (0 reviews)
      # mpn949900
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $722.79
    • (0 reviews)
      # mpn954113
      Front Driver Side Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Front Driver Side. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to...
      Direct fitMade from a heavy duty stainless steel outer shell
      $423.82
    • (0 reviews)
      # mpn221362026
      Front Driver Side Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Front Driver Side. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to...
      Direct fitMade from a heavy duty stainless steel outer shell
      $472.38
    • (0 reviews)
      # mpn952193
      Front Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Front. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These...
      Direct fitMade from a heavy duty stainless steel outer shell
      $451.69
    • (0 reviews)
      # mpn949109
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $639.90
    • (0 reviews)
      # mpn955136
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $773.55
    • (0 reviews)
      # mpn2511625620
      Front Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Front. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These...
      Direct fitMade from a heavy duty stainless steel outer shell
      $774.40
    • (0 reviews)
      # mpn955120
      Front Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Front. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These...
      Direct fitMade from a heavy duty stainless steel outer shell
      $354.53
    • (0 reviews)
      # mpn957318
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $585.67
    • (0 reviews)
      # mpn615929963
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Includes: Converter. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These...
      Direct fitMade from a heavy duty stainless steel outer shell
      $398.41
    • (0 reviews)
      # mpn955887
      Front Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Front. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These...
      Direct fitMade from a heavy duty stainless steel outer shell
      $465.29
    • (0 reviews)
      # mpn615929509
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $312.73
    • (0 reviews)
      # mpn221361917
      Front Driver Side Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Front Driver Side. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to...
      Direct fitMade from a heavy duty stainless steel outer shell
      $763.18
    • (0 reviews)
      # mpn949899
      Front Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Front. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These...
      Direct fitMade from a heavy duty stainless steel outer shell
      $599.05
    • (0 reviews)
      # mpn948429
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $621.87
    • (0 reviews)
      # mpn221362182
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $706.44
    • (0 reviews)
      # mpn2263352833
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $555.49
    • (0 reviews)
      # mpn615929957
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $348.43
    • (0 reviews)
      # mpn955116
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $411.95
    • (0 reviews)
      # mpn615930068
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $526.93
    • (0 reviews)
      # mpn615930037
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Flange Square Outlet. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These...
      Direct fitMade from a heavy duty stainless steel outer shell
      $469.81
    • (0 reviews)
      # mpn955878
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $547.30
    • (0 reviews)
      # mpn947562
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $874.66
    • (0 reviews)
      # mpn952202
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $543.34
    • (0 reviews)
      # mpn221361732
      Front Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Front. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These...
      Direct fitMade from a heavy duty stainless steel outer shell
      $643.83
    • (0 reviews)
      # mpn615929772
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $369.85
    • (0 reviews)
      # mpn221361718
      Front Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Front. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These...
      Direct fitMade from a heavy duty stainless steel outer shell
      $449.81
    • (0 reviews)
      # mpn947610
      Front Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Front. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These...
      Direct fitMade from a heavy duty stainless steel outer shell
      $401.76
    • (0 reviews)
      # mpn955134
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $491.69
    • (0 reviews)
      # mpn949890
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $834.49
    • (0 reviews)
      # mpn221361766
      Front Driver Side Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Front Driver Side. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to...
      Direct fitMade from a heavy duty stainless steel outer shell
      $807.09
    • (0 reviews)
      # mpn2263352804
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $489.80
    • (0 reviews)
      # mpn615929516
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $367.00
    • (0 reviews)
      # mpn615929991
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $384.13
    • (0 reviews)
      # mpn221361728
      Front Passenger Side Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Front Passenger Side. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without...
      Direct fitMade from a heavy duty stainless steel outer shell
      $390.22
    • (0 reviews)
      # mpn615929993
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $248.47
    • (0 reviews)
      # mpn615929952
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $332.72
    • (0 reviews)
      # mpn2263352734
      Exhaust Manifold with Integrated Catalytic Converter by DEC®. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are...
      Direct fitMade from a heavy duty stainless steel outer shell
      $394.13
    • (0 reviews)
      # mpn615929916
      Radiator Side Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Radiator Side. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail...
      Direct fitMade from a heavy duty stainless steel outer shell
      $369.85
    • (0 reviews)
      # mpn954126
      Front Driver Side Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Front Driver Side. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to...
      Direct fitMade from a heavy duty stainless steel outer shell
      $300.85
    • (0 reviews)
      # mpn221361701
      Front Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Front. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These...
      Direct fitMade from a heavy duty stainless steel outer shell
      $602.39
    • (0 reviews)
      # mpn221361737
      Driver Side Exhaust Manifold with Integrated Catalytic Converter by DEC®. Location: Driver Side. Emissions: EPA compliant. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again....
      Direct fitMade from a heavy duty stainless steel outer shell
      $681.41




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    Catalytic converters have been original equipment on most gasoline engine vehicles in the U.S. since 1975. They have evolved since their inception, from 2-way converters to 3-way converters plus air, to the modern 3-way converter. Early 2-way converters, also called oxidation catalytic converters, were so called because they only converted HC and CO. In the late 1970s and early 1980s they were replaced on most vehicles by 3-way converters, which can also control NOx emissions. 3-way converters are known as oxidation-reduction catalytic converters.

    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. The substrate 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 also have rhodium to reduce NOx. Early 3-way converters had a separate substrate that oxidized CO and HC with help from additional oxygen supplied by an air pump. Modern 3-way converters use advanced chemistry, O2 monitoring and computerized fuel control to convert all 3 harmful gases without the need for additional oxygen.

    Various factors can cause converter failure. Internal problems like plugging or reduced conversion efficiency are nearly always caused by engine problems like misfire, 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. A clogged converter will restrict exhaust flow resulting in poor performance. Other symptoms of a failed converter include rattling noises, an illuminated Check Engine light, and excessive emissions, which can result in a failed smog test.

    Regardless of the cause for catalytic converter malfunction and symptoms, 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 that are EPA (Environmental Protection Agency) and CARB (California Air Resources Board) compliant. 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. Many of our manifolds with integrated converters come as complete kits with all gaskets, hardware, and shields (as required) included.

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    Replacement Catalytic Converters Reviews

    Average rating:  4.5  4.5 - 300 reviews
      /  Read All Catalytic Converters Reviews
    4 of 5
    I Was Becoming So Tired Of "Codes"!
    I was treated quite well. It was easy to place the order, as I am not a mechanic. Your sales people were extremely helpful and explained everything I needed to know. The most calming aspect of the transaction was the follow-up. The muffler even got here early. Thank you.
    TPosted by Timothy (Alameda, CA) / April 16, 2017
    2001 Mazda Miata
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