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    • (7 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 high-spec...
      $54.23 - $479.48
    • (10 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 the...
      $28.06 - $1,239.25
    • (2 reviews)
      # 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...
      $85.57 - $480.50
    • (0 reviews)
      # sp4295
      Universal Fit Catalytic Converter by Eastern®. 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...
      $31.89 - $235.56
    • (6 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...
      $37.10 - $629.79
    • (0 reviews)
      # sp107734
      Catalytic Converter by Genuine®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at...
      $190.78 - $1,485.36
    • (5 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 which...
      $138.52 - $853.94
    • (4 reviews)
      # sp110016
      Direct Fit Catalytic Converter with Integrated Manifold by PaceSetter®. PaceSetter Manifold Catalytic Converters are custom-engineered to deliver maximum performance and efficiency from your engine with durability and ease of...
      $160.96 - $615.06
    • (6 reviews)
      # sp4294
      Direct Fit 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 great alternative to...
      $34.80 - $532.85
    • (0 reviews)
      # sp107600
      Exhaust Manifold with Integrated Catalytic Converter by Davico®. This product 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 the...
      $139.06 - $768.96
    • (2 reviews)
      # sp106558
      ECO III Stainless Steel Exhaust Manifold with Integrated Catalytic Converter by Eastern®. If you need to replace your failed or damaged manifold, this product is the right choice. Designed specifically for your vehicle, this manifold...
      $158.60 - $580.44
    • (2 reviews)
      # sp106567
      Standard Stainless Steel Exhaust Manifold with Integrated Catalytic Converter by Eastern®. If you need to replace your failed or damaged manifold, this product is the right choice. Designed specifically for your vehicle, this manifold...
      $238.52 - $560.91
    • (1 review)
      # sp109872
      Direct Fit Catalytic Converter with Integarted Exahust Manifold 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...
      $215.89 - $765.66
    • (1 review)
      # sp103492
      Stainless Steel Exhaust Manifold with Integrated Federal Catalytic Converter by AP Exhaust®. Catalytic Converter Substrate Material: Ceramic. Converter Body Material: Stainless Steel. Catalytic Converter Overall Length: 17.75""....
      $215.89 - $765.66
    • (2 reviews)
      # sp20037
      Manifold with Integrated 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 can’t do better than Bosal....
      $176.77 - $542.45
    • (3 reviews)
      # sp95244
      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...
      $148.73 - $1,043.82
    • (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 stainless...
      $227.05 - $1,126.69
    • (1 review)
      # sp10059
      Ultra™ 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...
      $49.95 - $124.81
    • (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 Walker, an...
      $59.36 - $257.74
    • (3 reviews)
      # sp128204
      Converter and Pipe Assembly 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 great alternative to a...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $75.25 - $746.73
    • (0 reviews)
      # sp128205
      ECO CARB Direct Fit Converter and Pipe Assembly 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
      $154.83 - $1,016.70
    • (4 reviews)
      # sp128207
      ECO II Direct Fit Converter and Pipe Assembly 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 great...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $100.44 - $561.66
    • (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 converter....
      $31.89 - $109.36
    • (2 reviews)
      # sp128208
      ECO III Direct Fit Converter and Pipe Assembly 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 great...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $134.71 - $597.32
    • (9 reviews)
      # sp128237
      Catalytic Converter and Pipe Assembly 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...
      5-year/50,000-mile warranty on converter body25,000-mile warranty on emissions
      $97.94 - $1,089.04
    • (1 review)
      # 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 the...
      $51.78 - $300.33
    • (5 reviews)
      # sp128225
      Catalytic Converter and Pipe Assembly 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...
      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
      $79.19 - $840.55
    • (0 reviews)
      # sp128230
      HM Grade Catalytic Converter and Pipe Assembly 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...
      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
      $273.64 - $277.50
    • (6 reviews)
      # sp128140
      Catalytic Converter and Pipe Assembly 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...
      Direct fitMade from a heavy duty stainless steel outer shell
      $84.25 - $1,297.32
    • (0 reviews)
      # sp109833
      Direct Fit Catalytic Converter (shipping restrictions) by A&B®. 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...
      $165.16 - $197.61




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    The BMW 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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    BMW Catalytic Converters Reviews

    Average rating:  5  5 - 3 reviews
    5 of 5
    Catalytic Converter
    I will shop with you guys over and over again, i was so excited to receive my item two days after my order. Item fit right, my installation was a success.
    LPosted by Lisa (Bridgeport, CT) / January 20, 2018
    2009 BMW X6
    Was this review helpful for you? Yes
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