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    • (0 reviews)
      # mpn1814874
      Ultra™ Stainless Steel Large Oval Direct Fit Catalytic Converter (15831) by Walker®. Includes: Bracket and Clamp. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter...
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $164.37
    • (0 reviews)
      # mpn1814876
      Ultra™ Stainless Steel Large Oval Direct Fit Catalytic Converter (15860) by Walker®. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Direct-Fit. Converter...
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $155.37
    • (0 reviews)
      # mpn1815821
      Ultra™ Stainless Steel Large Oval Direct Fit Catalytic Converter (40597) by Walker®. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Direct-Fit. Converter...
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $324.70
    • (0 reviews)
      # mpn1817084
      Ultra™ Stainless Steel Round Universal Fit Catalytic Converter (93271) by Walker®. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Universal Fit. Converter...
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $103.58
    • (0 reviews)
      # mpn1833644
      Ultra™ Stainless Steel Small Oval Universal Fit Catalytic Converter (93233) by Walker®. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Universal Fit....
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $101.04
    • (0 reviews)
      # mpn1852682
      Ultra™ Stainless Steel Large Oval Direct Fit Catalytic Converter (50418) by Walker®. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Direct-Fit. Converter...
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $263.90
    • (0 reviews)
      # mpn1852704
      Ultra™ Stainless Steel Round Direct Fit Catalytic Converter (54772) by Walker®. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Direct-Fit. Converter Body...
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $170.82
    • (0 reviews)
      # mpn1894126
      Ultra™ Stainless Steel Standard Oval Direct Fit Catalytic Converter (16547) by Walker®. Includes: Gasket. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration:...
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $219.28
    • (0 reviews)
      # mpn1894127
      Ultra™ Stainless Steel Standard Oval Direct Fit Catalytic Converter (16548) by Walker®. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Direct-Fit....
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $219.28
    • (0 reviews)
      # mpn104550192
      Stainless Steel Large Oval Direct Fit Catalytic Converter (15813) by Walker®. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Direct-Fit. Converter Body Material: Stainless Steel....
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $127.94
    • (0 reviews)
      # mpn104550193
      Stainless Steel Large Oval Direct Fit Catalytic Converter (15840) by Walker®. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Direct-Fit. Converter Body Material: Stainless Steel....
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $129.77
    • (0 reviews)
      # mpn104550341
      Ultra™ Stainless Steel Standard Oval Direct Fit Catalytic Converter (16574) by Walker®. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Direct-Fit....
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $160.71
    • (0 reviews)
      # mpn104552003
      Ultra™ Stainless Steel Standard Oval Direct Fit Catalytic Converter (55616) by Walker®. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Direct-Fit....
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $223.96
    • (0 reviews)
      # mpn1893579
      Stainless Steel Large Oval Direct Fit Catalytic Converter (50408) by Walker®. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Direct-Fit. Converter Body Material: Stainless Steel....
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $209.94
    • (0 reviews)
      # mpn831439932
      Ultra™ Stainless Steel Round Direct Fit Catalytic Converter (16581) by Walker®. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Direct-Fit. Converter Body...
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $346.12




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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 - 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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