The catalytic converter is part of your vehicle’s exhaust system, but more importantly, it’s a key component of the emissions system, taking the Carbon Monoxide (CO), Hydrocarbons (HC), and Oxides of Nitrogen (NOx) created during combustion, and turning them into water, Carbon Dioxide (CO2) and Nitrogen (N2). The device is so named because it contains catalysts, substances that cause a chemical reaction without themselves undergoing chemical change.

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    • (4 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
      $86.55 - $1,086.65
    • (8 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 - $993.23
    • (0 reviews)
      # sp20739
      Replacement Exhaust Kit by Bosal®. Get confidence with this high-standard OE quality purchase which is perfect for those who want to perform a long-lasting exhaust system repair. Made from top-notch materials, this dependable...
      Superior replacement for your worn out exhaust partHelps put your vehicle back to its tip-top shape
      $15.97 - $641.59
    • (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 - $1,104.60
    • (13 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 - $642.67
    • (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...
      $248.31 - $575.97
    • (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
      $135.41 - $528.73
    • (1 review)
      # 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
      $171.74 - $993.23
    • (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
      $1,247.12 - $1,657.64
    • (23 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,...
      $58.69 - $846.42
    • (0 reviews)
      # sp28287
      Exhaust Manifold with Catalytic Converter by ATP®. ATP Graywerks Exhaust Manifold-Converters provide a tested and proven solution to repair vehicles with increased emissions or check engine lights due to catalytic failures. All...
      Engineered as direct OE replacement ensuring manifold will line up and flow like the original unitHigh grade steel and precious metals resist fatigue and provide long lasting reliable catalyst performance
      $220.72 - $990.32
    • (6 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 - $707.98
    • (0 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
    • (0 reviews)
      # 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
      $72.74 - $77.53
    • (0 reviews)
      # sp13206
      Direct Fit Catalytic Converter with Integrated 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 be...
      Manufactured from high quality materialsDesign meet needs of OBDII equipped vehicles
      $197.83 - $714.07
    • (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...
      $56.41 - $489.18
    • (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 - $848.72
    • (1 review)
      # 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)
      $90.70 - $623.36
    • (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 - $304.28
    • (0 reviews)
      # sp15388
      Catalytic Converter by Genuine®. 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 your time and gas...
      $281.21 - $1,281.11
    • (8 reviews)
      # sp9239
      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
      $92.19 - $1,402.70
    • (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
      $38.88 - $267.25
    • (2 reviews)
      # sp13207
      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
      $101.50 - $864.64
    • (0 reviews)
      # sp9255
      Exhaust Pipe with Flex by DEC®. Durably built and precisely formed, DEC exhaust pipes deliver a proper fit and excellent exhaust system performance. They help to funnel poisonous and toxic fumes generated by the engine away from a...
      Helps to funnel poisonous fumes away from a vehicleEngineered to provide excellent performance
      $82.81 - $314.81
    • (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
      $38.88 - $267.25
    • (10 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
      $53.39 - $839.06
    • (0 reviews)
      # sp20039
      Catalytic Converter by Dorman®. Finish: Natural. Material: Stainless Steel. Exhaust Manifold Inlet Port Shape: Round. Without Installation Hardware. Bolt Hole Quantity: 4. PackageType: Box. Includes: 1 Catalytic Converter. More...
      High Quality construction to ensure long-lasting durabilityReplacement Regulates exhaust emissions and turns off check engine light
      $540.51 - $622.36
    • (0 reviews)
      # sp21031
      Diesel Direct Fit Oxidation Catalyst by Eastern®. Inlet A: 2 Bolt Spinner. Outlet A: 3 Bolt Welded. Overall Length: 64.25". Eastern offers a full line of catalytic converters designed for all types of Diesel engines. If you need...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $255.67
    • (0 reviews)
      # sp1394
      Catalytic Converter by Omix-Ada®. The catalytic converter converts harmful gases like Carbon Monoxide (CO) and unburned Hydrocarbons (HC) into less harmful gases like water vapor and Carbon Dioxide (CO2). The converter on your Jeep...
      $148.72 - $463.23
    • (0 reviews)
      # sp4222
      Catalytic Converter by Crown®. Crown Automotive is just the ticket if you want to get the most out of your vehicle as well as revel in a more exciting driving experience. You will surely get a real bang for the buck!
      $217.75 - $856.48
    • (0 reviews)
      # sp1904
      Header Pipe by Emico®. 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 your time and gas rushing out to...
      $129.89 - $646.21
    • (0 reviews)
      # sp32958
      Catalyst Cap Nut by HJS®. 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 your time and gas rushing out...
      $8.48
    • (0 reviews)
      # sp7654
      Exhaust Bracket by Goodmark®. Some other restoration sheet metal companies may carry popular panels like hoods, fenders and quarter panels, but far too often they come up empty when you need supporting parts like braces, brackets...
      Faithful reproduction of the original partHighest quality sheet metal parts available
      $19.66 - $41.11
    • (12 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...
      $1.36 - $48.20
    • (12 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...
      $1.36 - $48.20
    • (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
    • (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...
      $2.88 - $46.08
    • (0 reviews)
      # sp5330
      Catalytic Converter Gasket by AJUSA®. If you need durable gaskets to prevent leaks on your vehicle, Ajusa is the way to go. Engineered using the latest technologies and global engineering resources, the gaskets meet specific OEM...
      Direct OEM replacement for a proper fitEnsure reliable sealing performance
      $2.10 - $6.80
    • (0 reviews)
      # sp15390
      Catalytic Converter Gasket by Genuine®. 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 your time and...
      $9.10 - $52.11
    • (1 review)
      # sp1891
      Exhaust Gasket by Nippon Reinz®. 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 your time and gas...
      $5.14 - $40.95
    • (0 reviews)
      # sp1888
      Exhaust Gasket by Elring®. 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 your time and gas rushing...
      $3.94 - $27.89
    • (0 reviews)
      # sp32885
      Catalytic Converter Heat Shield Retainer by Wagner®. The Catalytic Converter Heat Shield is essential for keeping heat from the exhaust system, away from adjacent automobile parts and flammable materials positioned under the...
      Direct replacement ensures a proper fit every timeFor extra protection our Heat Shield Bolts are galvanized for rust-resistance
      $10.52
    • (0 reviews)
      # sp32492
      Rear Exhaust Heat Shields by Auto Metal Direct®, 1 Pair. The restoration experts at Auto Metal Direct manufacture correct OE-quality replacement parts that will help you restore your vehicle to its original condition. Authentic...
      Direct fit replacementMade according to OE specs
      $58.88
    • (0 reviews)
      # mpn1426006411
      Ultra™ Stainless Steel Round Manifold with Integrated Catalytic Converter (16611) by Walker®. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Direct Fit....
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $394.00
    • (0 reviews)
      # mpn1426030264
      Ultra™ Stainless Steel Round Catalytic Converter (50569) by Walker®. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Direct Fit. Converter Body Material:...
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $579.05
    • (0 reviews)
      # mpn1426006361
      Ultra™ Stainless Steel Round Manifold with Integrated Catalytic Converter (16578) by Walker®. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No. Converter Configuration: Direct Fit....
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $339.89
    • (0 reviews)
      # mpn1426006458
      Ultra™ Driver Side Stainless Steel Round Manifold with Integrated Catalytic Converter (16667) by Walker®. Location: Driver Side. Catalytic Series: Ultra™. Catalytic Converter Substrate Material: Ceramic. CARB Compliant: No....
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $309.09
    • (0 reviews)
      # mpn1883327
      Spring Bolt Kit (35031) by Walker®. Inlet Quantity: 1 Inlet. Outlet Quantity: 1 Outlet. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the...
      Makes installation quick and easyOptimal OE-style fit and quality
      $10.44
    • (0 reviews)
      # mpn1748792
      Spring (35281) by Walker®. Inlet Quantity: 1 Inlet. Outlet Quantity: 1 Outlet. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the complete...
      Makes installation quick and easyOptimal OE-style fit and quality
      $5.48
    • (1 review)
      # mpn1832836
      Spring Bolt Kit (36454) by Walker®. Inlet Quantity: 1 Inlet. Outlet Quantity: 1 Outlet. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the...
      Makes installation quick and easyOptimal OE-style fit and quality
      $7.65
    • (0 reviews)
      # mpn1847343
      Stainless Steel Bare 2 Bolt Flange (31961) by Walker®. Material: Stainless Steel. Inlet Quantity: 1 Inlet. Outlet Quantity: 1 Outlet. Thickness: 1.25". Finish: Bare. With their extensive selection of accessories and hardware for...
      Makes installation quick and easyOptimal OE-style fit and quality
      $18.81
    • (2 reviews)
      # mpn1849679
      Spring Bolt Kit (35129) by Walker®. Inlet Quantity: 1 Inlet. Outlet Quantity: 1 Outlet. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the...
      Makes installation quick and easyOptimal OE-style fit and quality
      $8.12
    • (0 reviews)
      # mpn1858564
      Stainless Steel Bare 2 Bolt Flange (31885) by Walker®. Material: Stainless Steel. Inlet Quantity: 1 Inlet. Outlet Quantity: 1 Outlet. Thickness: 0.62". Finish: Bare. With their extensive selection of accessories and hardware for...
      Makes installation quick and easyOptimal OE-style fit and quality
      $7.81
    • (0 reviews)
      # mpn1858565
      Stainless Steel Bare Slotted 2 Bolt Flange (31886) by Walker®. Material: Stainless Steel. Inlet Quantity: 1 Inlet. Outlet Quantity: 1 Outlet. Thickness: 0.33". Finish: Bare. With their extensive selection of accessories and...
      Makes installation quick and easyOptimal OE-style fit and quality
      $9.38
    • (0 reviews)
      # mpn1858568
      Stainless Steel Bare 3 Bolt Flange (31927) by Walker®. Material: Stainless Steel. Inlet Quantity: 1 Inlet. Outlet Quantity: 1 Outlet. Thickness: 0.6". Finish: Bare. With their extensive selection of accessories and hardware for the...
      Makes installation quick and easyOptimal OE-style fit and quality
      $4.55
    • (0 reviews)
      # mpn1858569
      Stainless Steel Bare 2 Bolt Flange (31942) by Walker®. Material: Stainless Steel. Inlet Quantity: 1 Inlet. Outlet Quantity: 1 Outlet. Finish: Bare. With their extensive selection of accessories and hardware for the exhaust system,...
      Makes installation quick and easyOptimal OE-style fit and quality
      $9.97
    • (0 reviews)
      # mpn1572673
      Stainless Steel Bare 3 Bolt Flange (31803) by Walker®. Material: Stainless Steel. Inlet Quantity: 1 Inlet. Outlet Quantity: 1 Outlet. Thickness: 0.39". Finish: Bare. With their extensive selection of accessories and hardware for...
      Makes installation quick and easyOptimal OE-style fit and quality
      $7.64
    • (0 reviews)
      # mpn1572674
      Stainless Steel Bare 2 Bolt Flange (31851) by Walker®. Material: Stainless Steel. Inlet Quantity: 1 Inlet. Outlet Quantity: 1 Outlet. Thickness: 1.05". Finish: Bare. With their extensive selection of accessories and hardware for...
      Makes installation quick and easyOptimal OE-style fit and quality
      $8.23
    • (0 reviews)
      # mpn1572675
      Stainless Steel Bare 2 Bolt Flange (31853) by Walker®. Material: Stainless Steel. Inlet Quantity: 1 Inlet. Outlet Quantity: 1 Outlet. Thickness: 0.38". Finish: Bare. With their extensive selection of accessories and hardware for...
      Makes installation quick and easyOptimal OE-style fit and quality
      $9.60




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    Catalytic converters have evolved since their inception, from 2-way converters to 3-way converters plus air, to the modern 3-way converter. In general a converter is composed of a cylindrical stainless steel enclosure housing a monolithic substrate which contains the catalyst. The most common catalyst materials are the precious metals platinum, palladium, and rhodium. Heat shields are attached to the outside of the converter to protect the undercarriage.

    The substrate in the converter is constructed to expose as much exhaust gas as possible to the catalyst as it flows through the converter, for maximum conversion and efficiency. 2-way converters use platinum and palladium to oxidize CO and HC. 3-way converters were developed to reduce NOx as well as oxidize CO and HC. They have a front substrate coated with rhodium to reduce NOx, and a second substrate that oxidizes CO and HC with help from the additional oxygen supplied by the air pump. Modern 3-way converters use advanced chemistry to convert all 3 harmful gases without the need for additional oxygen.

    Although catalytic converters were designed to last many thousands of miles, there are factors that can cause their failure. Internal problems like plugging or reduced conversion efficiency are nearly always caused by engine problems like misfire, a rich air/fuel mixture, coolant leaks, and oil burning. Misfires and excessive fuel can cause the converter to overheat and melt the substrate, while oil and antifreeze can coat the surface of the substrate, preventing catalyst exposure to the exhaust. In its location under the vehicle, the converter is also exposed to impact from road debris that could cause structural damage.

    Regardless of the cause for catalytic converter malfunction and symptoms: Check Engine light on, loss of power, failed smog test, or physical damage, we can supply you with a replacement that will restore performance and make your vehicle emissions legal. We offer both direct fit and universal converters. A direct fit converter will fit and function the same as your factory converter, and bolt right in place in your exhaust system, while a universal converter will require pipe cutting and clamping or welding for attachment. We also offer converters for applications where the converter is part of the exhaust manifold.

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    Replacement Catalytic Converters Reviews

    Average rating:  4.5  4.6 - 186 reviews
    Read All Catalytic Converters Reviews
    4 of 5
    Great Item But Didn't Fit
    The product seemed to be of a high quality, but unfortunately, it didn't fit my car.
    CPosted by Cristian (Red Bluff, CA) /
    1999 Mazda 626
    Was this review helpful for you? Yes
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