Scion Catalytic Converters

The Scion 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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    • Walker® Direct Fit Catalytic Converter
      (17 reviews)
      # 4303
      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,...
      $89.73 - $949.09
    • Walker® Catalytic Converter
      (19 reviews)
      # 4305
      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...
      $62.31 - $949.09
    • Eastern® Direct Fit Catalytic Converter
      (1 reviews)
      # 4294
      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...
      $95.60 - $532.78
    • Eastern® EPA Direct Fit Undercar Catalytic Converter
      (10 reviews)
      # 7036
      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 - $1,144.85
    • Bosal® Catalytic Converter
      (8 reviews)
      # 4602
      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...
      $76.59 - $884.01
    • Walker® Universal Fit Catalytic Converter
      (2 reviews)
      # 4304
      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...
      $62.31 - $204.47
    • Walker® Exhaust Manifold with Integrated Catalytic Converter
      (0 reviews)
      # 4302
      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...
      $165.22 - $837.80
    • Bosal® Replacement Catalytic Converter
      (8 reviews)
      # 7148
      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...
      $88.98 - $884.01
    • Eastern® EPA Universal Fit Undercar Catalytic Converter
      (6 reviews)
      # 7037
      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 - $363.49
    • Walker® Exhaust Gasket
      (11 reviews)
      # 4409
      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...
      $1.66 - $29.46
    • Dorman® Exhaust Manifolds with Integrated Catalytic Converter
      (2 reviews)
      # 6943
      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 - $573.70
    • Walker® Ultra™ Universal Fit Rear Catalytic Converter
      (0 reviews)
      # 1806778
      Ultra™ Universal Fit Rear Catalytic Converter (93251) by Walker®. Without Air Tube, Body Dimensions - 8" L x 4.375" W x 4.5" H, Material - SS (Body) / Ceramic (Substrate), Body Shape - Round, Universal, Connection Type - Pipe...
      Emission Warranty: 5 Years / 50,000 Miles (80,000 Kilometers)Structural Warranty: 5 Years / 50,000 Miles (80,000 Kilometers)
      $85.93
    • Walker® Spring Bolt Kit
      (1 reviews)
      # 1832836
      Spring Bolt Kit by Walker®. 1 Inlet, 1 Outlet. 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...
      Makes installation quick and easyOptimal OE-style fit and quality
      $6.77
    • Walker® Exhaust Nut
      (0 reviews)
      # 104550202
      Exhaust Nut (35079) by Walker®. 1 Inlet, 1 Outlet. 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...
      Makes installation quick and easyOptimal OE-style fit and quality
      $0.25
    • Walker® CalCat™ Universal Fit Rear Catalytic Converter
      (0 reviews)
      # 104549944
      CalCat™ Universal Fit Rear Catalytic Converter (83205) by Walker®. Without Air Tube, Body Dimensions - 8" L x 4.125" W x 4.125" H, Material - Ceramic (Substrate), Body Shape - 4" Round, Converter Position - Rear, Universal,...
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $108.63