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    • (1 review)
      # 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...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $144.17 - $1,086.65
    • (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...
      Direct OEM replacementCast iron or stainless tubular construction protects against cracking and warping
      $40.95 - $535.66
    • (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...
      Direct fitMade from a heavy duty stainless steel outer shell
      $234.53 - $1,301.21
    • (12 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...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $41.49 - $789.48
    • (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 exhaustEPA & CARB Emissions Products Available for Most Vehicles
      $227.71 - $461.86
    • (1 review)
      # sp18944
      Direct Fit Catalytic Converter by PaceSetter®. CARB Compliant: No. Converter Configuration: Direct Fit. Catalytic Converter Format: Main Catalytic Converter. Stainless Steel. Custom Engineered to deliver maximum performance and...
      Catalytic Converters are a direct replacement for original equipmentEngineered for durability and ease of installation
      $111.61 - $572.03
    • (2 reviews)
      # sp20037
      Premium Load Manifold with Integrated Federal 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...
      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
      $181.68 - $541.48
    • (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...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $160.32 - $1,239.00
    • (0 reviews)
      # sp20707
      Diesel Particulate Filter by Dorman®. The Diesel Particulate Filter (DPF) is an integral component for diesel trucks and helps to maintain the proper performance of the diesel engine. Essential for keeping harmful emissions out of...
      Direct replacement for a proper fit every timeReplacement is designed to match OE fit, form, and function
      $1,233.91 - $1,679.14
    • (8 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,...
      Flange to flange, direct fit design bolts to existing exhaustEPA & CARB Emissions Products Available for Most Vehicles
      $69.60 - $463.61
    • (7 reviews)
      # sp13664
      Direct Fit Catalytic Converter by Davico®. This direct-fit catalytic converter by Davico will be a great solution to replace your failed or damaged catalytic converter. Once your stock cat fails to perform its job, replacement is...
      Helps your vehicle emit harmless gasesDirect OEM replacement
      $18.21 - $1,311.11
    • (2 reviews)
      # sp21032
      Manifold with Integrated Catalytic Converter by Eastern®. Catalytic Series: ECO CARB. Converter Configuration: Direct Fit. Catalytic Converter Format: Main Catalytic Converter. CARB Compliant: Yes. Inlet Type 2: 6 Bolt Welded Inlet...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $167.52 - $787.20
    • (1 review)
      # 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....
      EPA & CARB Emissions Products Available for Most Vehicles5 Year / 50,000 Miles Warranty on Structural Components
      $65.36 - $104.18
    • (3 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...
      EPA & CARB Emissions Products Available for Most VehiclesEmission, Structural Warranty: 5 Years / 50,000 Miles (80,000 Kilometers)
      $49.43 - $435.22
    • (0 reviews)
      # sp20134
      3.8L , Engine Gasket Set by Sealed Power®. Intake Manifold Gaskets with Rubber-Plastic End Seals with Locating Pins. Advanced exhaust systems on diesel vehicles play an integral role in reducing emissions to an environmentally...
      After reassembly, units are media blasted and coated to renew exterior appearance and increase corrosion protection.All applicable O.E.-quality temperature sensors and sealing gaskets are provided to ensure a complete repair.
      $762.15 - $859.60
    • (17 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...
      5 Year / 50,000 Miles Warranty on Structural Components5 Year / 50,000 Miles Warranty on Exhaust Emission (CARB Models)
      $76.07 - $846.42
    • (0 reviews)
      # sp21034
      Universal Fit Torpedo Catalytic Converter by Eastern®. Inlet A: 3". Outlet A: 3". Overall Length: 28". Converter Body Length: 23". Whether your catalytic converter is damaged by road debris or failed due to an engine problem, you...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $299.82 - $300.45
    • (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...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $38.50 - $267.25
    • (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...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $38.50 - $267.25
    • (8 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...
      Ensures an even distribution of the gas flow in the converter to deliver optimized conversion of harmful gasesConcepts-enhance the reduction of emissions and ensure a high durability
      $63.45 - $839.06
    • (0 reviews)
      # sp49148
      Direct Fit Catalytic Converter with Integarted Exahust Manifold (Shipping Restrictions) by AP Exhaust®. The growing concern for the environment means there is a growing need for quality emission control products. AP catalysts and...
      Manufactured from high quality materialsDesign meet needs of OBDII equipped vehicles
      $197.83 - $714.07
    • (10 reviews)
      # sp26979
      Direct Fit Catalytic Converters California Legal by Walker®. Walker offers complete coverage: direct-fit mufflers, converters, pipes, resonators and accessories. Walker is an OE supplier to many major nameplate vehicle...
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $110.04 - $832.96
    • (0 reviews)
      # sp38324
      by WP EMICO Catalytic Converter (Shipping Restriction). Is your car noisier these days? Can you smell exhaust fumes in the cabin? Exhaust system repairs should not be put off, both for safety and legal reasons, but before you waste...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $171.56 - $645.77
    • (0 reviews)
      # sp6393
      Exhaust Gasket by Beck Arnley®. For one hundred years, Beck/Arnley has been providing premium OE quality parts for vehicles. Beginning with motorcycle parts in 1914 and transitioning to import vehicles in the 1950’s, brand...
      OE quality products from top original equipmentTop quality materials
      $3.19 - $55.12
    • (18 reviews)
      # sp4410
      Exhaust Hanger 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...
      Makes installation quick and easyOptimal OE-style fit and quality
      $0.91 - $39.56
    • (18 reviews)
      # sp4411
      Exhaust Rubber Insulator 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...
      Makes installation quick and easyOptimal OE-style fit and quality
      $0.91 - $39.56
    • (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...
      OE quality parts from top original equipment and aftermarket manufacturersFast shipping; 1-2 day delivery time regardless of where you’re located
      $2.80 - $46.08
    • (6 reviews)
      # sp92788
      Catalytic Converter by DEC®. Converter Configuration: Direct Fit. 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...
      Direct fitMade from a heavy duty stainless steel outer shell
      $92.19 - $1,271.88
    • (0 reviews)
      # mpn2072549613
      Tubular Natural Exhaust Manifold with Integrated Catalytic Converter (674-861) by Dorman®. Includes: Exhaust Manifold, 1 Input Gasket, 1 Output Flange. Finish: Natural. Inlet Port Shape: Oval. Material: Tubular. More like a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $406.98
    • (0 reviews)
      # mpn2072750785
      Front Exhaust Manifold with Integrated Catalytic Converter by Dorman®. Finish: Natural. Material: Cast Iron. Exhaust Manifold Inlet Port Shape: Round. Installation Hardware Included: Not Required. Bolt Hole Quantity: 2. Package...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $299.17
    • (0 reviews)
      # mpn2072631174
      Cast Iron Natural Exhaust Manifold with Integrated Catalytic Converter (674-932) by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Cast Iron. More like a complete kit...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $348.34
    • (0 reviews)
      # mpn2072617545
      Cast Iron Natural Exhaust Manifold with Integrated Catalytic Converter (674-991) by Dorman®. Includes: Exhaust Manifold, 1 Input Gasket, 1 Output Flange, 2 Studs, 4 Heat Shield Bolts, 4 Heat Shield Washers. Finish: Natural. Inlet...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $258.16
    • (0 reviews)
      # mpn2072769393
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter (674-894) by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Stainless Steel. More like a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $337.97
    • (0 reviews)
      # mpn2072651579
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter (673-883) by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Stainless Steel. More like a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $324.30
    • (0 reviews)
      # mpn2072657900
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter (674-702) by Dorman®. Includes: Exhaust Manifold, 1 Manifold Gasket, 1 Flange Gasket, 2 Studs, 2 Nuts, 1 Bracket Adaptor. Finish: Natural. Inlet Port...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $361.28
    • (0 reviews)
      # mpn2072641114
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter (674-141) by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Stainless Steel. More like a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $463.06
    • (0 reviews)
      # mpn2072617546
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter (673-861) by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Stainless Steel. More like a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $469.44
    • (0 reviews)
      # mpn2072642108
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter (674-883) by Dorman®. Includes: Exhaust Manifold, 1 Input Gasket, 2 Studs, 2 Washers, 2 Nuts. Finish: Natural. Inlet Port Shape: Round. Material:...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $182.13
    • (0 reviews)
      # mpn2072766392
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter (673-894) by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Stainless Steel. More like a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $605.65
    • (0 reviews)
      # mpn2072617550
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter (673-831) by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Stainless Steel. More like a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $467.15
    • (0 reviews)
      # mpn2072566693
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter (674-831) by Dorman®. Includes: Exhaust Manifold, 1 Input Gasket, 1 Output Flange. Finish: Natural. Inlet Port Shape: Square. Material: Stainless Steel....
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $341.16
    • (0 reviews)
      # mpn2072668485
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter (674-822) by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Stainless Steel. More like a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $462.33
    • (0 reviews)
      # mpn2072723820
      Cast Iron Natural Exhaust Manifold with Integrated Catalytic Converter by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Cast Iron. More like a complete kit than a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $237.96
    • (0 reviews)
      # mpn2072692629
      Cast Iron Natural Exhaust Manifold with Integrated Catalytic Converter by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Cast Iron. More like a complete kit than a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $200.81
    • (0 reviews)
      # mpn2072657895
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter (674-595) by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Stainless Steel. More like a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $206.14
    • (0 reviews)
      # mpn2072611789
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter (673-830) by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Stainless Steel. More like a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $449.60
    • (0 reviews)
      # mpn2072657883
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter (673-595) by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Stainless Steel. More like a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $324.30
    • (0 reviews)
      # mpn2389262305
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter (674-255) by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Stainless Steel. More like a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $258.75
    • (0 reviews)
      # mpn2389255459
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter (674-256) by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Stainless Steel. More like a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $250.23
    • (0 reviews)
      # mpn2191263394
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter by Dorman®. Includes: Exhaust Manifold, Gaskets and Hardware. Finish: Natural. Inlet Port Shape: Round. Material: Stainless Steel. More like a complete...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $263.56
    • (0 reviews)
      # mpn2072533983
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter by Dorman®. Includes: Exhaust Manifold, 1 Input Gasket, 1 Output Gasket, 2 Studs, 2 Nuts. Finish: Natural. Inlet Port Shape: Square. Material: Stainless...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $338.34
    • (0 reviews)
      # mpn2072708954
      Stainless Steel Natural Exhaust Manifold with Integrated Catalytic Converter by Dorman®. Includes: Exhaust Manifold, 1 Manifold Gasket and 1 Flange. Finish: Natural. Inlet Port Shape: Round. Material: Stainless Steel. More like a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $280.87
    • (0 reviews)
      # mpn104552165
      CalCat™ Exhaust Manifold with Integrated Catalytic Converter (82561) by Walker®. Carb Compliant: Yes. Catalytic Converter Overall Length: 13". Converter Configuration: Direct Fit. Series: CalCat™. Walker offers complete...
      Constructed to meet your vehicle’s specific emissions requirementsDirect fit design
      $440.94
    • (0 reviews)
      # mpn831440041
      Ultra™ Exhaust Manifold with Integrated Catalytic Converter (16630) by Walker®. Carb Compliant: No. Catalytic Converter Overall Length: 15.88". Converter Configuration: Direct Fit. Series: Ultra™. Walker is an OE supplier to...
      Constructed to meet your vehicle’s specific emissions requirementsDesigned to meet EPA regulations
      $300.33
    • (0 reviews)
      # mpn1832354
      Ultra™ Ceramic Exhaust Manifold with Integrated Catalytic Converter (16452) by Walker®. Carb Compliant: No. Material: Ceramic. Catalytic Converter Overall Length: 14.5". Converter Configuration: Direct Fit. Series: Ultra™....
      Constructed to meet your vehicle’s specific emissions requirementsDesigned to meet EPA regulations
      $352.29
    • (0 reviews)
      # mpn1832360
      Ultra™ Ceramic Exhaust Manifold (16475) by Walker®. Carb Compliant: No. Material: Ceramic. Catalytic Converter Overall Length: 23". Converter Configuration: Direct Fit. Series: Ultra™. Walker is an OE supplier to many major...
      Constructed to meet your vehicle’s specific emissions requirementsDesigned to meet EPA regulations
      $412.60
    • (0 reviews)
      # mpn1832361
      Ultra™ Round Body Exhaust Manifold with Integrated Catalytic Converter (16476) by Walker®. CARB Compliant: No. Series: Ultra™. Substrate Material: Ceramic. Emissions: EPA compliant. Converter Configuration: Direct Fit. Body...
      Constructed to meet your vehicle’s specific emissions requirementsDesigned to meet EPA regulations
      $383.91
    • (0 reviews)
      # mpn831439950
      Ultra™ Ceramic Exhaust Manifold with Integrated Catalytic Converter (16605) by Walker®. Carb Compliant: No. Material: Ceramic. Catalytic Converter Overall Length: 15". Converter Configuration: Direct Fit. Series: Ultra™....
      Constructed to meet your vehicle’s specific emissions requirementsDesigned to meet EPA regulations
      $445.78
    • (0 reviews)
      # mpn1832386
      CalCat™ Round Body Exhaust Manifold with Integrated Catalytic Converter (82558) by Walker®. CARB Compliant: Yes. Series: CalCat™. Substrate Material: Ceramic. Emissions: CARB compliant. Converter Configuration: Direct Fit....
      Constructed to meet your vehicle’s specific emissions requirementsDirect fit design
      $338.80
    • (0 reviews)
      # mpn1832355
      Ultra™ Ceramic Exhaust Manifold with Integrated Catalytic Converter (16453) by Walker®. Carb Compliant: No. Material: Ceramic. Catalytic Converter Overall Length: 24.75". Converter Configuration: Direct Fit. Series: Ultra™....
      Constructed to meet your vehicle’s specific emissions requirementsDesigned to meet EPA regulations
      $238.31




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    The Ford 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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