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    • Walker® Direct Fit Catalytic Converter
      (17 reviews)
      # sp4303
      Direct Fit 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 manufacturers. Trust Walker,...
      $65.46 - $827.24
    • Walker® Catalytic Converter
      (17 reviews)
      # sp4305
      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 manufacturers. Trust Walker, an industry...
      $65.46 - $827.24
    • Eastern® Direct Fit Catalytic Converter
      (0 reviews)
      # sp4294
      Direct Fit Catalytic Converter by Eastern Catalytic®. If you need to replace your failed or damaged catalytic converter, this product is the right choice. Designed specifically for your vehicle, this catalytic converter is a great...
      $86.30 - $1,086.65
    • Eastern® EPA Direct Fit Undercar Catalytic Converter
      (11 reviews)
      # sp7036
      EPA Direct Fit Undercar Catalytic Converter by Eastern®. If you need to replace your failed or damaged catalytic converter, this product is the right choice. Designed specifically for your vehicle, this catalytic converter is a...
      $41.49 - $789.47
    • Victor Reinz® Catalytic Converter Gasket
      (0 reviews)
      # sp5612
      Catalytic Converter Gasket by Victor Reinz®. When you’re low on oil, coolant or some other fluid, you may be tempted to just run down to the local auto parts chain store. But before you waste your time and gas only to find high...
      $2.77 - $44.50
    • Bosal® Catalytic Converter
      (7 reviews)
      # sp4602
      Catalytic Converter by Bosal®. Bosal has a comprehensive range of more than 1,000 petrol and diesel catalytic converters, including the latest Euro 4 type-approved units. Manufactured in TUV-certified plants using the latest...
      $65.25 - $884.01
    • Walker® Universal Fit Catalytic Converter
      (0 reviews)
      # sp4304
      Universal Fit 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 manufacturers. Trust...
      $65.46 - $127.56
    • Walker® Diesel Particulate Filter
      (0 reviews)
      # sp7655
      Diesel Particulate Filter by Walker®. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the complete exhaust job. When you choose Walker...
      $1,399.09 - $1,651.45
    • Walker® Exhaust Manifold with Integrated Catalytic Converter
      (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...
      $76.05 - $530.67
    • Bosal® Replacement Catalytic Converter
      (7 reviews)
      # sp7148
      Replacement 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 advanced manufacturing techniques...
      $65.25 - $839.06
    • Eastern® EPA Universal Fit Undercar Catalytic Converter
      (6 reviews)
      # sp7037
      Whether your catalytic converter is damaged by road debris or failed due to an engine problem, you definitely need a new one, and this product is the way to go. Made of stainless steel, the catalytic converter is designed to reduce...
      $38.88 - $345.51
    • Walker® Exhaust Gasket
      (13 reviews)
      # sp4409
      Exhaust Gasket by Walker®. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the complete exhaust job. When you choose Walker accessories, you...
      $1.16 - $28.83
    • Eastern® Universal Fit Catalytic Converter
      (0 reviews)
      # sp4295
      Universal Fit Catalytic Converter by Eastern Catalytic®. Whether your catalytic converter is damaged by road debris or failed due to an engine problem, you definitely need a new one, and this product is the way to go. Made of...
      $65.15 - $246.15
    • Dorman® Exhaust Manifolds with Integrated Catalytic Converter
      (2 reviews)
      # sp6943
      Exhaust Manifold with Integrated Catalytic Converter 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...
      $177.46 - $1,283.73
    • MagnaFlow® Direct Fit Federal Catalytic Converter (93432)
      (0 reviews)
      # mpn1120837
      Direct Fit Federal Catalytic Converter by MagnaFlow®. 2.5" Inlet / 2.5" Outlet Diameter. 8.25" Width. 2.25" Tubing Diameter. Without Air Tube. If your car needs replacement, install one that will get you through the smog check and...
      Converter body manufactured from heavy-duty stainless steelIncreases exhaust flow compared to original factory converter
      $144.58




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    The GMC catalytic converter (AKA catcon or cat) was first introduced in the mid-70's, and back then, it performed only two tasks, which is exactly why it was called a two-way converter. It oxidized carbon monoxide to carbon dioxide and hydrocarbons to water and carbon dioxide (oxidation stage). In 1981, the two-way converter was replaced by a much more efficient three-way catcon, which additionally reduced nitrogen oxide emissions (reduction stage).

    Today, the two-way version is used in diesel applications only, while most vehicles are equipped with a three-way catalytic converter. Located between the engine and muffler, the converter actually resembles a muffler in shape, though the construction of these two units is completely different. The body of the converter is usually made of stainless steel. Inside the body, you'll find an insulated chamber, which contains three main components of any converter: substrate (or catalyst core), washcoat, and catalyst.

    The catalyst core usually has a honeycomb structure, and it's most often a ceramic monolith. Basically, it serves as a support for the washcoat. The washcoat itself is a carrier for the catalytic materials. Materials for the washcoat are chosen to form an irregular surface, which maximizes the catalytically active layer available to react with the exhaust gases. And then comes the catalyst, which is most ofter a mixture of precious metals such as palladium (oxidation catalyst) and rhodium (reduction catalyst). When the exhaust stream passes through the converter, it contacts with the catalyst and all the toxic elements covert into the harmless substances. The leaving gas is monitored by the control system to make sure it meets the emissions requirements.

    GMC Catalytic Converters Reviews

    Average rating:  5  5 - 2 reviews
    4.5 of 5
    Exact Fit For My Envoy 2002
    Couldn't get over 40 miles per hour with out it bogging down, moved 3 bolts at the top and a couple from the back, took a bit to wiggle out backwards but it came out and the new unit slid in. Tightened the bolts and started it up, slight air leak in the gasket, probably will have to re-tighten again as it settles into position. Power is back. Runs perfect now. I would buy and do this again. J.
    JPosted by Jeffrey M (Ann Arbor, MI) /
    2002 GMC Envoy
    Was this review helpful for you? Yes
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