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    • (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
      $32.91 - $265.49
    • (8 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)
      # 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...
      A multitude of Universal converter bodies provided for maximum coverageProvides professional installer with immediate installation options
      $48.83 - $360.70
    • (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. Without Air Tube. With O2 Sensor Port. Catalytic...
      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)
      # 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 - $116.82
    • (1 review)
      # 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
    • (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...
      Direct OEM replacementDesigned with twice the amount of Rhodium to help keep the MIL off on vehicles with high mileage, low emissions, or higher than normal emissions
      $74.99 - $91.65
    • (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
    • (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)
      # 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)
      # 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...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $96.49 - $100.25
    • (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. The new Eastern Catalytic...
      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)
      # 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)
      # 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)
      # 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)
      # 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)
      # 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)
      # 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)
      # 504578921
      Universal 608 Series Catalytic Converter by AP Exhaust®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Without Air Tube. Three-Way No / Air OBDII By Design US-EPA Compliant catalytic converters are efficient at...
      A multitude of Universal converter bodies provided for maximum coverageProvides professional installer with immediate installation options
      $63.09 - $169.43
    • (0 reviews)
      # 504706719
      Universal Enhanced Standard Duty Catalytic Converter by AP Exhaust®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Oval. Without O2 Sensor Port. Three-Way No / Air OBDII By Design...
      A multitude of Universal converter bodies provided for maximum coverageProvides professional installer with immediate installation options
      $49.54 - $102.90
    • (0 reviews)
      # mpn474117414
      Universal Heavy Duty Catalytic Converter by AP Exhaust®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Oval. With Single Air Tube. With O2 Sensor Port. Catalytic Converter Overall...
      A multitude of Universal converter bodies provided for maximum coverageProvides professional installer with immediate installation options
      $146.63
    • (0 reviews)
      # 504629737
      Universal High Flow Catalytic Converter by AP Exhaust®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without Air Tube. Without O2 Sensor Port. Three-Way No / Air OBDII By...
      A multitude of Universal converter bodies provided for maximum coverageProvides professional installer with immediate installation options
      $140.90 - $183.93
    • (0 reviews)
      # mpn474117777
      Universal Large Body Super X Duty Catalytic Converter by AP Exhaust®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Oval. Without Air Tube. With O2 Sensor Port. Catalytic...
      A multitude of Universal converter bodies provided for maximum coverageProvides professional installer with immediate installation options
      $128.72
    • (0 reviews)
      # 504580905
      Universal Medium Duty Catalytic Converter by AP Exhaust®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Oval. Three-Way No / Air OBDII By Design US-EPA Compliant catalytic...
      A multitude of Universal converter bodies provided for maximum coverageProvides professional installer with immediate installation options
      $89.70 - $105.02
    • (0 reviews)
      # 504613706
      Universal Standard Duty Spun Body Catalytic Converter by AP Exhaust®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without Air Tube. Without O2 Sensor Port. Catalytic...
      A multitude of Universal converter bodies provided for maximum coverageProvides professional installer with immediate installation options
      $41.48
    • (0 reviews)
      # 286167555
      Universal Catalytic Converter by AP Exhaust®. Converter Configuration: Universal Fit. Without Air Tube. Without O2 Sensor Port. Three-Way No / Air OBDII By Design US-EPA Compliant catalytic converters are efficient at the oxidation...
      A multitude of Universal converter bodies provided for maximum coverageProvides professional installer with immediate installation options
      $129.33 - $206.76
    • (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
      $48.83 - $169.19
    • (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
      $1.79
    • (0 reviews)
      # mpn1206811
      ECO CARB Catalytic Converter by Eastern®. Emissions: CARB compliant. Converter Configuration: Universal Fit. Position: Center. Catalytic Converter Body Shape: Round. Catalytic Converter Overall Length: 16". Whether your catalytic...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $172.21
    • (0 reviews)
      # mpn1206809
      ECO CARB Catalytic Converter by Eastern®. Emissions: CARB compliant. Converter Configuration: Universal Fit. Position: Center. Catalytic Converter Body Shape: Round. Catalytic Converter Overall Length: 16". Whether your catalytic...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $172.21
    • (0 reviews)
      # mpn474117396
      Heavy 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: 2.5"....
      A multitude of Universal converter bodies provided for maximum coverageProvides professional installer with immediate installation options
      $117.45
    • (0 reviews)
      # mpn619997038
      Catalytic Converter (MAS82001) 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
      $349.86
    • (0 reviews)
      # mpn619997035
      Standard Catalytic Converter (MAS2002) 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
      $361.28
    • (0 reviews)
      # mpn619997037
      Standard Catalytic Converter (MAS2001) 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
      $361.28
    • (0 reviews)
      # mpn500300086
      Universal Air Tube Adapter (23097) by Walker®. Includes: Adapter- 1/2" X 5/8", Tube Connector, Hose Clamp 9/16", Spring Forming Air Tube, Connector Hose, (2) Clamp 1/2". With their extensive selection of accessories and hardware...
      Makes installation quick and easyOptimal OE-style fit and quality
      $16.30
    • (0 reviews)
      # mpn500318677
      Universal Air Tube Kit (35590) by Walker®. Includes: Air Tube - 0.75 Id Inlet, 0.605 Od Outlet. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do...
      Makes installation quick and easyOptimal OE-style fit and quality
      $5.98
    • (0 reviews)
      # mpn500321378
      Universal Air Tube Silicone Hose (36344) by Walker®. Includes: Silicone Hose 3/4-In I.D., (2) Hose Clamps. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything...
      Makes installation quick and easyOptimal OE-style fit and quality
      $11.29
    • (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. Without Air Tube. With O2 Sensor Port. Catalytic...
      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. Without Air Tube. With O2 Sensor Port. Catalytic...
      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)
      # mpn500338414
      Universal Ultra™ Catalytic Converter (93314) by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Oval. With 1 Inlet. Without Air Tube. With O2 Sensor Port. Catalytic...
      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)
      # mpn500288413
      Universal Catalytic Converter (15143) by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large 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
      $116.82
    • (0 reviews)
      # mpn500288410
      Universal Catalytic Converter (15104) by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. With 1 Inlet. Without Air Tube. With O2 Sensor Port. Catalytic Converter...
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $87.81
    • (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 Air Tube. Without O2 Sensor Port. Catalytic Converter...
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $57.57
    • (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)
      # 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
    • (1 review)
      # mpn1249698
      Universal Bullet Cat™ ECO II Catalytic Converter (82255) by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without O2 Sensor Ports. Catalytic Inlet Diameter: 2"....
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $73.90
    • (1 review)
      # mpn1233514
      Universal Bullet Cat™ ECO II Catalytic Converter (81255) by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without O2 Sensor Ports. Catalytic Inlet Diameter: 2"....
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $60.47
    • (1 review)
      # mpn1249699
      Universal Bullet Cat™ ECO II Catalytic Converter (82256) 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
      $73.90
    • (1 review)
      # mpn1233515
      Universal Bullet Cat™ ECO II Catalytic Converter (81256) 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
      $60.47
    • (1 review)
      # mpn1249700
      Universal Bullet Cat™ ECO II Catalytic Converter (82257) by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without O2 Sensor Ports. Catalytic Inlet Diameter: 3"....
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $73.90
    • (1 review)
      # mpn1233516
      Universal Bullet Cat™ ECO II Catalytic Converter (81257) by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without O2 Sensor Ports. Catalytic Inlet Diameter: 3"....
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $60.47
    • (1 review)
      # mpn1249712
      Universal Bullet Cat™ ECO III Catalytic Converter (92255) by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without O2 Sensor Ports. Catalytic Inlet Diameter:...
      Direct OEM replacementDesigned with twice the amount of Rhodium to help keep the MIL off on vehicles with high mileage, low emissions, or higher than normal emissions
      $91.65
    • (1 review)
      # mpn1233532
      Universal Bullet Cat™ ECO III Catalytic Converter (91255) by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without O2 Sensor Ports. Catalytic Inlet Diameter:...
      Direct OEM replacementDesigned with twice the amount of Rhodium to help keep the MIL off on vehicles with high mileage, low emissions, or higher than normal emissions
      $74.99
    • (1 review)
      # mpn1249713
      Universal Bullet Cat™ ECO III Catalytic Converter (92256) by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without O2 Sensor Ports. Catalytic Inlet Diameter:...
      Direct OEM replacementDesigned with twice the amount of Rhodium to help keep the MIL off on vehicles with high mileage, low emissions, or higher than normal emissions
      $91.65
    • (1 review)
      # mpn1233533
      Universal Bullet Cat™ ECO III Catalytic Converter (91256) by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without O2 Sensor Ports. Catalytic Inlet Diameter:...
      Direct OEM replacementDesigned with twice the amount of Rhodium to help keep the MIL off on vehicles with high mileage, low emissions, or higher than normal emissions
      $74.99
    • (1 review)
      # mpn1249714
      Universal Bullet Cat™ ECO III Catalytic Converter (92257) by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without O2 Sensor Ports. Catalytic Inlet Diameter:...
      Direct OEM replacementDesigned with twice the amount of Rhodium to help keep the MIL off on vehicles with high mileage, low emissions, or higher than normal emissions
      $91.65
    • (1 review)
      # mpn1233534
      Universal Bullet Cat™ ECO III Catalytic Converter (91257) by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without O2 Sensor Ports. Catalytic Inlet Diameter:...
      Direct OEM replacementDesigned with twice the amount of Rhodium to help keep the MIL off on vehicles with high mileage, low emissions, or higher than normal emissions
      $74.99
    • (0 reviews)
      # mpn926155136
      Universal ECO GM Catalytic Converter (99834) by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Round. With 1 O2 Sensor Port. Catalytic Inlet Diameter: 2". Catalytic...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $81.04
    • (0 reviews)
      # mpn1246127
      Universal ECO GM Catalytic Converter (99734) by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Round. With 1 Angled O2 Sensor Port. Catalytic Inlet Diameter: 2"....
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $81.04
    • (0 reviews)
      # mpn1247373
      Universal ECO GM Catalytic Converter (99735) by Eastern®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Large Round. With 1 Angled O2 Sensor Port. Catalytic Inlet Diameter: 2.3"....
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $81.04




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    The Maserati 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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