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    • (0 reviews)
      # sp18723
      Replacement Exhaust Kit by Walker.
      $1.82 - $846.42
    • (0 reviews)
      # sp18723
      Replacement Exhaust Kit by Walker.
      $1.82 - $846.42
    • (0 reviews)
      # sp18723
      Replacement Exhaust Kit by Walker.
      $1.82 - $846.42
    • (6 reviews)
      # sp4033
      Exhaust Manifold by Dorman. Whether your exhaust manifold is cracked or broken, you definitely need to replace it, and this product is a great solution. Thanks to its strong tubular construction, the Dorman exhaust manifold is...
      $5.96 - $974.79
    • (0 reviews)
      # sp4033
      Exhaust Manifold by Dorman. Whether your exhaust manifold is cracked or broken, you definitely need to replace it, and this product is a great solution. Thanks to its strong tubular construction, the Dorman exhaust manifold is...
      $5.96 - $732.84
    • (0 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...
      $162.71 - $732.84
    • (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...
      $260.17 - $512.43
    • (0 reviews)
      # sp9246
      Exhaust Manifold with Integrated Catalytic Converter by DEC. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters are made from a heavy duty...
      $17.33 - $933.80
    • (0 reviews)
      # sp7146
      CalCat Universal Fit Rear 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....
      $70.74 - $210.48
    • (19 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, an...
      $58.69 - $846.42
    • (1 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 Walker,...
      $56.41 - $435.22
    • (20 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...
      $56.41 - $846.42
    • (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...
      $1,305.81 - $1,651.45
    • (0 reviews)
      # sp10058
      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 leader, for the finest emission...
      $90.70 - $662.45
    • (0 reviews)
      # sp10059
      Universal Fit Ultra 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...
      $77.53 - $80.15




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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.

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    GMC Catalytic Converters Reviews

    Average rating:  5  5 - 3 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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