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    • (4 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)
      $50.42 - $423.33
    • (14 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...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $35.11 - $1,108.38
    • (7 reviews)
      # sp106571
      ECO II Universal Fit Undercar Catalytic Converter by Eastern®. Focused on manufacturing only top-grade emission control products, Eastern Catalytic will perfectly serve your purpose if you opt for a high quality catalytic...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $32.91 - $265.49
    • (0 reviews)
      # sp94077
      Universal Fit Catalytic Converter by AP Exhaust®. Three-Way No / Air OBDII By Design US-EPA Compliant catalytic converters are efficient at the oxidation of HC’s and CO, and very efficient at the reduction of NOx, storing O2, and...
      Manufactured from high quality materialsDesign meet needs of OBDII equipped vehicles
      $43.26 - $348.41
    • (0 reviews)
      # sp93964
      Direct Fit Catalytic Converter by AP Exhaust®. The growing concern for the environment means there is a growing need for quality emission control products. AP catalysts and catalytic convert systems can be found in a vast array of...
      Manufactured from high quality materialsDesign meet needs of OBDII equipped vehicles
      $55.56 - $1,037.68
    • (0 reviews)
      # sp92788
      Direct Fit 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 stainless steel outer shell...
      Direct fitMade from a heavy duty stainless steel outer shell
      $84.25 - $1,297.32
    • (0 reviews)
      # 286167923
      Universal Catalytic Converter by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. With 1 Inlet. This part features the correct load of precious metals to ensure the proper limitation of tailpipe emissions....
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $57.49 - $110.45
    • (0 reviews)
      # 286167897
      Universal Ultra™ Catalytic Converter by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Oval. With 1 Inlet. With O2 Sensor Port. Catalytic Converter Overall Length:...
      High precious metal load and high technology washcoat for premium performanceStainless steel body and aluminized body and pipe heat shields for durability
      $103.26 - $109.22
    • (0 reviews)
      # 286167639
      Universal Bullet Cat™ ECO II Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without O2 Sensor Ports. Whether your catalytic converter is...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $60.47 - $73.90
    • (0 reviews)
      # 286167631
      Universal ECO GM Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Round. Catalytic Converter Overall Length: 16". Keep your exhaust emissions...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $76.65 - $81.04
    • (1 review)
      # 286167645
      Universal Bullet Cat™ ECO III Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without O2 Sensor Ports. Whether your catalytic converter is...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $74.99 - $91.65
    • (0 reviews)
      # 286167775
      Universal Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Oval. Keep your exhaust emissions within specifications and your vehicle running in top...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $38.48 - $98.73
    • (0 reviews)
      # 286167832
      Universal QuieCat™ ECO III Resonated Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Oval. Catalytic Converter Overall Length: 18". The new...
      Baffled tube reduces sound levels by 35% without losing horsepowerHigh flow design retains maximum engine output and maximizes catalytic efficiency
      $96.49 - $100.25
    • (0 reviews)
      # 286167853
      Universal Standard Stuffed Tube Catalytic Converter with EndCap by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without O2 Sensor Ports. Whether your catalytic...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $41.99 - $42.82
    • (0 reviews)
      # 286167831
      Universal QuieCat™ ECO II Resonated Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Oval. Catalytic Converter Overall Length: 18". The new Eastern...
      Baffled tube reduces sound levels by 35% without losing horsepowerHigh flow design retains maximum engine output and maximizes catalytic efficiency
      $77.82 - $80.84
    • (0 reviews)
      # 286167741
      Universal Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Round. With 1 O2 Sensor Port. Catalytic Converter Overall Length: 16". Keep your...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $63.42 - $82.22
    • (0 reviews)
      # 286167833
      Universal QuieCat™ Standard Resonated Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Oval. Without O2 Sensor Ports. Catalytic Converter Overall...
      Baffled tube reduces sound levels by 35% without losing horsepowerHigh flow design retains maximum engine output and maximizes catalytic efficiency
      $52.13 - $54.90
    • (0 reviews)
      # 286167714
      Universal Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Oval. Keep your exhaust emissions within specifications and your vehicle running in...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $64.76 - $138.89
    • (0 reviews)
      # 286167836
      Universal Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Keep your exhaust emissions within specifications and your vehicle running in top...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $35.97 - $82.22
    • (0 reviews)
      # 286167555
      Universal Catalytic Converter by AP Exhaust®. Converter Configuration: Universal Fit. Three-Way No / Air OBDII By Design US-EPA Compliant catalytic converters are efficient at the oxidation of HC’s and CO, and very efficient at...
      Manufactured from high quality materialsDesign meet needs of OBDII equipped vehicles
      $42.73 - $319.50
    • (0 reviews)
      # 286167591
      Universal Catalytic Converter by Bosal®. Converter Configuration: Universal Fit. 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...
      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
      $48.83 - $103.10
    • (0 reviews)
      # 286167901
      Universal Catalytic Converter by Bosal®. Converter Configuration: Universal Fit. 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...
      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
      $60.48 - $169.19
    • (0 reviews)
      # 350072412
      Universal Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Contains approximately 40% higher precious metal content than most other...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $176.32 - $200.72
    • (0 reviews)
      # 128881714
      Universal Air Tube Saddle Clamp by AP Exhaust®. This superior product was carefully designed with key attention to detail and manufactured from high-grade materials to the strict standards of the highest quality. This AP Exhaust...
      Made from first-rate materialsEnsures outstanding durability
      $1.73
    • (0 reviews)
      # mpn2888398743
      CalCat™ Catalytic Converter by Walker®. Emissions: CARB compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Oval. With 1 Inlet. Without O2 Sensor Port. Catalytic Converter Overall Length: 13.25"....
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $110.06
    • (0 reviews)
      # mpn1744160
      Ultra™ Catalytic Converter by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. With 1 Inlet. Without Air Tube. Without O2 Sensor Port. Catalytic Converter Overall...
      Emission, Structural Warranty: 5 Years / 50,000 Miles (80,000 Kilometers)Comply with specific pre-OBDII and OBDII requirements in the state of California
      $53.20
    • (0 reviews)
      # mpn1705742
      Ultra™ Catalytic Converter by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Small Oval. With 1 Inlet. With Air Tube. Without O2 Sensor Port. Catalytic Converter Overall...
      Emission, Structural Warranty: 5 Years / 50,000 Miles (80,000 Kilometers)Comply with specific pre-OBDII and OBDII requirements in the state of California
      $58.93
    • (0 reviews)
      # mpn104550190
      Ultra™ Catalytic Converter by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Small Oval. With 1 Inlet. With Air Tube. Without O2 Sensor Port. Catalytic Converter Overall...
      Emission, Structural Warranty: 5 Years / 50,000 Miles (80,000 Kilometers)Comply with specific pre-OBDII and OBDII requirements in the state of California
      $66.39
    • (0 reviews)
      # mpn2888398752
      CalCat™ Catalytic Converter by Walker®. Emissions: CARB compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. With 1 Inlet. Without O2 Sensor Port. Catalytic Converter Overall Length: 12"....
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $110.06
    • (0 reviews)
      # mpn1705745
      Ultra™ Catalytic Converter by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Small Oval. With 1 Inlet. Without Air Tube. Without O2 Sensor Port. Catalytic Converter...
      Emission, Structural Warranty: 5 Years / 50,000 Miles (80,000 Kilometers)Comply with specific pre-OBDII and OBDII requirements in the state of California
      $50.42
    • (0 reviews)
      # mpn2888399509
      CalCat™ Catalytic Converter by Walker®. Emissions: CARB compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. With 1 Inlet. Without O2 Sensor Port. Catalytic Converter Overall Length: 12"....
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $94.36
    • (0 reviews)
      # mpn1693866
      Ultra™ Catalytic Converter by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. With 1 Inlet. Without Air Tube. Without O2 Sensor Port. Catalytic Converter Overall...
      Emission, Structural Warranty: 5 Years / 50,000 Miles (80,000 Kilometers)Comply with specific pre-OBDII and OBDII requirements in the state of California
      $57.57
    • (0 reviews)
      # mpn1206804
      Standard Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Position: Undercar. Catalytic Converter Body Shape: Oval. Without O2 Sensor Ports. Catalytic Inlet Diameter: 2.3"....
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $38.30
    • (0 reviews)
      # mpn1206803
      Standard Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Position: Undercar. Catalytic Converter Body Shape: Oval. Without O2 Sensor Ports. Catalytic Inlet Diameter: 2". Catalytic...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $38.30
    • (0 reviews)
      # mpn1237871
      ECO II Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Position: Undercar. Catalytic Converter Body Shape: Oval. With 1 O2 Sensor Port. Catalytic Inlet Diameter: 2.3". Catalytic...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $59.66
    • (0 reviews)
      # mpn1258149
      Standard Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Direct Fit. Position: Undercar. With 1 O2 Sensor Port. Catalytic Inlet Diameter: 2.3". Catalytic Outlet Diameter: 2.3". Catalytic...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $134.49
    • (0 reviews)
      # mpn1258154
      Standard Catalytic Converter by Eastern®. Emissions: EPA compliant. Converter Configuration: Direct Fit. Position: Undercar. Without O2 Sensor Ports. Catalytic Converter Overall Length: 14". If you need to replace your failed or...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $166.85
    • (0 reviews)
      # mpn474117270
      Standard Duty Catalytic Converter by AP Exhaust®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Oval. Without Air Tube. Without O2 Sensor Port. Catalytic Inlet Diameter: 2"....
      Manufactured from high quality materialsDesign meet needs of OBDII equipped vehicles
      $50.37
    • (0 reviews)
      # mpn474117269
      Standard Duty Catalytic Converter by AP Exhaust®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Oval. Without Air Tube. Without O2 Sensor Port. Catalytic Inlet Diameter: 1.75"....
      Manufactured from high quality materialsDesign meet needs of OBDII equipped vehicles
      $50.37
    • (0 reviews)
      # mpn474123015
      Catalytic Converter by AP Exhaust®. Emissions: CARB compliant. Converter Configuration: Direct Fit. Position: Center. Catalytic Converter Body Shape: Round. Without O2 Sensor Port. Catalytic Inlet Diameter: 2.25". Catalytic Outlet...
      Manufactured from high quality materialsDesign meet needs of OBDII equipped vehicles
      $119.40
    • (0 reviews)
      # mpn474117271
      Standard Duty Catalytic Converter by AP Exhaust®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Oval. Without Air Tube. Without O2 Sensor Port. Catalytic Inlet Diameter: 2.25"....
      Manufactured from high quality materialsDesign meet needs of OBDII equipped vehicles
      $50.37
    • (0 reviews)
      # mpn1233537
      Universal ECO III Stuffed Tube Catalytic Converter with EndCap by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without O2 Sensor Ports. Catalytic Inlet Diameter:...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $73.95
    • (0 reviews)
      # mpn1265154
      Standard Catalytic Converter (40170) by Eastern®. Emissions: EPA compliant. Converter Configuration: Direct Fit. Position: Undercar. Without O2 Sensor Ports. Catalytic Converter Overall Length: 21". If you need to replace your...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $131.91
    • (0 reviews)
      # mpn474116884
      Catalytic Converter (58219) by AP Exhaust®. Emissions: CARB compliant. Converter Configuration: Direct Fit. Position: Center. The growing concern for the environment means there is a growing need for quality emission control...
      Manufactured from high quality materialsDesign meet needs of OBDII equipped vehicles
      $88.06
    • (0 reviews)
      # mpn619998045
      Standard Catalytic Converter (PEU4207) by DEC®. Emissions: EPA compliant. Converter Configuration: Direct Fit. With All 2.25" Ball. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to...
      Direct fitMade from a heavy duty stainless steel outer shell
      $238.48
    • (0 reviews)
      # mpn619998040
      Standard Catalytic Converter (PEU4201) by DEC®. Emissions: EPA compliant. Converter Configuration: Direct Fit. With All 1.25" Ball. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to...
      Direct fitMade from a heavy duty stainless steel outer shell
      $238.48
    • (0 reviews)
      # mpn619998048
      Standard Catalytic Converter (PEU4204) by DEC®. Emissions: EPA compliant. Converter Configuration: Direct Fit. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These...
      Direct fitMade from a heavy duty stainless steel outer shell
      $238.48
    • (0 reviews)
      # mpn619998049
      Catalytic Converter (PEU84204) by DEC®. Emissions: CARB compliant. 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...
      Direct fitMade from a heavy duty stainless steel outer shell
      $321.30
    • (0 reviews)
      # mpn619998042
      Catalytic Converter (PEU84207) by DEC®. Emissions: CARB compliant. Converter Configuration: Direct Fit. With All 2.25" Ball. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail...
      Direct fitMade from a heavy duty stainless steel outer shell
      $312.73
    • (0 reviews)
      # mpn619998046
      Catalytic Converter (PEU84206) by DEC®. Emissions: CARB compliant. 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...
      Direct fitMade from a heavy duty stainless steel outer shell
      $321.30
    • (0 reviews)
      # mpn619998041
      Catalytic Converter (PEU84208) by DEC®. Emissions: CARB compliant. Converter Configuration: Direct Fit. With 2.25" Ball. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again....
      Direct fitMade from a heavy duty stainless steel outer shell
      $321.30
    • (0 reviews)
      # mpn619998047
      Standard Catalytic Converter (PEU4206) by DEC®. Emissions: EPA compliant. Converter Configuration: Direct Fit. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These...
      Direct fitMade from a heavy duty stainless steel outer shell
      $238.48
    • (0 reviews)
      # mpn619998044
      Standard Catalytic Converter (PEU4208) by DEC®. Emissions: EPA compliant. Converter Configuration: Direct Fit. With 2.25" Ball. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail...
      Direct fitMade from a heavy duty stainless steel outer shell
      $238.48
    • (0 reviews)
      # mpn500288410
      Universal Catalytic Converter (15104) by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. With 1 Inlet. With O2 Sensor Port. Catalytic Converter Overall Length:...
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $78.12
    • (0 reviews)
      # mpn500288408
      Universal Catalytic Converter (15039) by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Small Oval. With 1 Inlet. Without Air Tube. Without O2 Sensor Port. Catalytic...
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $57.49
    • (0 reviews)
      # mpn500338412
      Universal Ultra™ Catalytic Converter (93312) by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Oval. With 1 Inlet. With O2 Sensor Port. Catalytic Converter Overall...
      High precious metal load and high technology washcoat for premium performanceStainless steel body and aluminized body and pipe heat shields for durability
      $109.22
    • (0 reviews)
      # mpn500338413
      Universal Ultra™ Catalytic Converter (93313) by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Oval. With 1 Inlet. With O2 Sensor Port. Catalytic Converter Overall...
      High precious metal load and high technology washcoat for premium performanceStainless steel body and aluminized body and pipe heat shields for durability
      $103.26
    • (0 reviews)
      # mpn500288407
      Universal Catalytic Converter (15034) by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Small Oval. With 1 Inlet. With Air Tube. Without O2 Sensor Port. Catalytic...
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $58.93
    • (0 reviews)
      # mpn500288409
      Universal Catalytic Converter (15054) by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. With 1 Inlet. Without O2 Sensor Port. Catalytic Converter Overall Length:...
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $57.57
    • (0 reviews)
      # mpn500338414
      Universal Ultra™ Catalytic Converter (93314) by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Oval. With 1 Inlet. With O2 Sensor Port. Catalytic Converter Overall...
      High precious metal load and high technology washcoat for premium performanceStainless steel body and aluminized body and pipe heat shields for durability
      $103.26




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    The Peugeot 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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