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Last updated: January 2026
This directory lists 47 catalytic converter manufacturers across the United States, from high-volume automotive OEM suppliers to niche industrial exhaust system specialists.
Buyers are primarily solving critical emissions compliance challenges, ranging from meeting EPA and CARB standards for new vehicle programs to upgrading existing industrial systems for reduced NOx, CO, and hydrocarbon emissions. They seek expertise in optimizing PGM loading and washcoat formulations for specific duty cycles and exhaust stream characteristics, often balancing performance requirements with cost targets and crucial oxygen storage capacity.
Suppliers in this space vary significantly. Some are vertically integrated, handling everything from PGM sourcing and recovery to substrate coating and final canning. Others specialize in specific areas, such as metallic substrate development for high-performance applications, or provide comprehensive engineering support for complex industrial emission control systems, including DPF (Diesel Particulate Filter) integration.
Buyers should arrive prepared with detailed specifications including engine type, fuel, exhaust gas temperature profiles, target emissions reductions (e.g., NOx, CO, HC), annual volume forecasts, and desired catalyst durability. Suppliers will expect clear engineering drawings, CAD models if applicable, and an understanding of the end-use environment and regulatory landscape the converter must operate within, including any required on-board diagnostic (OBD-II) readiness standards.
A significant trend shaping this category is the ongoing push for alternative PGM-reducing technologies and novel catalyst materials, driven by volatile precious metal prices and the long-term impact of vehicle electrification. Manufacturers are increasingly investing in R&D for lower-PGM washcoats or exploring non-PGM catalysts for specific applications, alongside a growing emphasis on the full lifecycle and recyclability of catalytic components.
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47 companies nationwide
ACS Industries, Inc. based in Lincoln, RI, manufactures exhaust emission control and after-treatment system components for automotive OEMs and Tier 1 suppliers. They specialize in woven, expanded, and knitted wire mesh production, offering services like sintering, brazing, stamping, and assembly for exhaust system applications.
Based in Corona, CA, aFe POWER designs and manufactures high-quality performance automotive products. Their extensive product line includes catalytic converters, cold air intakes, and exhaust systems for various vehicles. All products are meticulously tested and built in-house, focusing on enhancing vehicle performance.
Allied Energy Group specializes in manufacturing high-performance nano-coatings for catalytic converter components, utilizing platinum, rhodium, and palladium. They provide comprehensive emissions solutions, including 3-way catalysts, oxidation catalysts, and catalyst substrates. The company focuses on delivering durable products with performance warranties for industrial applications.
Carb & Turbo, based in Shakopee, MN, manufactures alternative fuel conversion systems and parts. They offer proprietary BlueCAT™ emission control systems for LPG and natural gas fueled engines, ensuring cleaner emissions and extended engine life for industrial applications.
Based in California, Bassani Manufacturing specializes in multi-faceted tube bending, metal fabricating, and exhaust system manufacturing. The company offers extensive experience in producing custom metal components and assemblies for various applications.
Based in Largo, FL, Cone Engineering has been manufacturing high-quality aftermarket exhaust components and kits for automotive, motorcycle, and marine industries since 1970. They specialize in custom fabrication of various exhaust parts, including mufflers, headers, collectors, bends, and tubing.
Based in Dublin, GA, Dinex Aftermarket US provides heavy-duty aftermarket exhaust and emission solutions. The company supplies components for various vehicles, focusing on high-quality and reliable emission control systems for the North American market.
Based in Goldsboro, NC, Durafit is an American manufacturer specializing in replacement diesel particulate filters (DPFs) and diesel oxidation catalysts (DOCs). They design and build emissions control devices for heavy-duty commercial vehicles, equipment, and fleets, ensuring compliance and extended service life for their customers.
Global Emissions Systems Inc. designs, develops, and manufactures emissions control solutions. The company provides systems for power generation, as well as for on-road and off-road heavy-duty applications. They focus on advanced technology to manage exhaust emissions effectively.
Grand Rock Exhaust Systems is a U.S. manufacturer of exhaust system components, producing over 95% of its product line in North East Ohio. Utilizing U.S.-sourced steel, the company specializes in manufacturing various exhaust parts, including those for heavy-duty and commercial vehicles, directly supporting catalytic converter needs within these systems.
Based in Houston, TX, IntoCeramics is a ceramics manufacturing company and toll/contract producer. They specialize in advanced ceramic catalyst materials designed for high-performance applications and environmental solutions, taking products from raw materials to final development. The company also offers consulting services for ceramics manufacturing processes.
Based in Statesville, NC, Kooks Headers & Exhaust manufactures custom-engineered, high-performance exhaust systems, including headers, mufflers, and catalytic converters. Specializing in durable 304L stainless steel products, the company builds components for street, race, and off-road applications, proudly manufacturing in the USA.
KUS, based in Davie, FL, is a global manufacturer specializing in SCR system components. With over two decades of expertise, the company provides critical emission control technology for automotive and industrial applications.
Johnson Matthey manufactures advanced catalysts and platinum group metal (PGM) chemicals for industrial applications. They are a primary provider of essential catalyst components for catalytic converters used in automotive and industrial emissions control, supporting product development and process improvement.
Maxim Silencers engineers and manufactures industrial-grade silencers for noise and emission control in the USA. Serving the oil & gas, power generation, and other industrial markets, the company provides custom solutions, including integrated units combining silencers with catalytic converters for effective emission management.
Performance Industries specializes in manufacturing metallic substrates, custom-tailored for various industrial applications. Based in Coppell, TX, the company offers a comprehensive range of substrate configurations. They provide essential components for catalytic converter manufacturers, ensuring high-performance metallic substrates meet specific client needs for diverse products.
Miller CAT Corp manufactures catalytic converters, offering EPA/Federal compliant MCATX Converters and the MCX Explorer Line. The company also produces converter protection devices and various other exhaust accessories. Miller CAT Corp's entire product range is manufactured in the United States.
Based in Tulsa, OK, MIRATECH Corp manufactures advanced diesel oxidation catalysts. The company specializes in high-performance emission catalyst elements engineered for both stationary large and small diesel engines, providing critical solutions for reducing emissions in various industrial applications.
Based in Lewis Center, OH, Nexceris specializes in the production of catalyst materials and FuelCellMaterials. The company provides solutions from small-scale through pilot-scale volumes, contributing essential components for the clean energy transition, including those used in catalytic converter manufacturing.
Private Label Mfg specializes in producing a wide range of aftermarket catalytic converters. Located in City of Industry, CA, the company offers high-quality vehicle components designed for various motor and turbo applications, serving the private label market with its manufacturing capabilities.
Street Series Performance manufactures R-CAT catalytic converters and a range of premium exhaust brands in the USA. The company crafts products with high-grade materials and precision manufacturing, ensuring rigorous quality control. Offerings include Street Flow and Street Max exhaust lines.
Based in Coppell, TX, Synergy Catalyst manufactures exclusive catalysts engineered for optimal cost efficiency and conversion. The company provides OEM certified, ISO-certified catalysts designed for various industrial applications, ensuring high quality and performance.
Tempest manufactures catalytic converters designed to reduce CO emissions. Their Leader CAT product effectively lowers carbon monoxide from Honda GX160 and GX200 engines by up to 80%, performing across all unleaded fuels. The company specializes in industrial emission control solutions.
Ultramet fabricates advanced catalysts and catalyst supports using refractory metals, platinum group metals, and ceramics. Specializing in materials science and engineering for extreme environments, the company serves diverse industries including Aerospace, Medical, Chemical, Semiconductor, Nuclear, and Oil & Gas with high-performance solutions.
Walker Exhaust provides direct-fit and universal catalytic converters for automotive applications. The company manufactures components compliant with all EPA and CARB requirements, ensuring high performance and regulatory adherence for vehicles. They specialize in exhaust system solutions for the aftermarket.
Applied Catalysts, based in Grand Junction, CO, manufactures a wide range of catalysts for air pollution control and engine emissions. The company provides essential catalytic components for diverse industrial and environmental applications, including catalytic converters, appliances, and various chemical processes.
Advanced Catalyst Systems, LLC, based in Maryville, TN, provides oxidation and three-way catalysts for lean and rich burn engines. The company specializes in industrial catalytic solutions, serving major clients like Exxon Mobil and BP Petroleum by removing harmful emissions from the atmosphere.
BASF ECMS manufactures innovative, cost-effective emission control catalysts for diverse vehicles, including cars, trucks, and heavy-duty equipment. Leveraging deep expertise in precious metals and catalysis, the company develops sustainable solutions to meet strict global emissions regulations, operating manufacturing facilities in major geographies, including South Carolina.
Based in New Bedford, MA, Davico Manufacturing produces direct fit and universal catalytic converters for import and domestic cars, light trucks, and vans. The company also manufactures various exhaust products. Davico leverages catalyst technology and manufacturing expertise to serve stocking distributors and online sellers across North America.
Mammoth Equipment is a family-owned manufacturing company specializing in exhaust, thermal, air intake, and emission control products for heavy-duty diesel equipment. With over 50 years of experience, they provide integrated solutions to industries globally that utilize diesel equipment.
Based in Charlevoix, Michigan, ACAT Global manufactures direct-fit catalytic converter systems. Their US-produced metallic core converters are designed for various cars and trucks, including popular models like Ford F-150 and Toyota Tundra. ACAT Global provides quality replacement catalytic converters backed by a limited lifetime warranty.
Babcock & Wilcox specializes in industrial energy and environmental solutions, providing and installing SCR (Selective Catalytic Reduction) systems for effective NOx reduction. Their systems, which integrate catalytic technology, are used in applications involving fossil fuels, biomass, and municipal waste for environmental compliance.
Based in Bloomer, WI, Catalytic Combustion Corporation designs, develops, and manufactures emission control systems. They produce catalytic products that remove harmful substances and noise from process exhaust. Their manufacturing capabilities support diverse applications, ranging from large industrial systems to smaller catalysts for household appliances.
Based in Oxnard, CA, CDTi Advanced Materials Inc. specializes in catalyst technology for emissions reduction and clean energy. With 30 years of experience, the company designs and produces patented solutions, including combustion engine catalyst technology, next-gen catalyst coating for carbon capture, and catalyst technology critical for hydrogen production.
Based in Golden, CO, CoorsTek specializes in manufacturing advanced ceramic catalyst support media. These vital components are engineered for precision manufacturing applications within the chemicals and petrochemicals industries, supplying essential materials to producers of catalytic converters and related industrial systems.
Based in Zurich, IL, Catalytic Products International specializes in manufacturing catalysts. They offer expertise in METAC All-Metal-Catalyst technology and various ceramic formulations. The company also provides comprehensive catalyst testing and related services, supporting industrial clients with advanced catalytic solutions.
Donaldson Company manufactures exhaust systems and advanced filtration products, serving transportation, construction, and manufacturing industries. They provide original equipment for heavy-duty trucks and partner with Daimler Truck North America on advanced vehicle projects. Based in Bloomington, MN, Donaldson develops technologies to solve complex filtration challenges.
Emissions and Silencer Technology (EST) is a custom manufacturer of catalytic converters and silencer/converters based in Pinehurst, TX. They engineer oxidation, 3-way, and SCR solutions for stationary rich-burn and lean-burn industrial natural gas and diesel engines, serving power generation and gas compression applications.
Flowmaster provides high-performance catalytic converters engineered for automotive applications. Their products are designed to enhance exhaust flow and optimize vehicle performance while ensuring compliance with emissions control standards for various systems.
Based in Bowling Green, KY, Holley is a prominent designer, manufacturer, and marketer of high-performance automotive aftermarket products. Through its Flowmaster brand, the company specializes in producing a comprehensive range of exhaust components, including Federal and California-compliant catalytic converters, for a wide variety of vehicles.
Based in Oceanside, CA, MagnaFlow manufactures high-performance exhaust systems, mufflers, and catalytic converters. They produce OE design catalytic converters compliant with EPA and CARB emissions regulations, available for direct purchase with fast shipping and an industry-leading warranty.
Based in Mooresville, NC, NGK Ceramics USA manufactures HONEYCERAM® honeycomb catalyst substrates for automotive emissions control. Utilizing unique ceramic technologies, this subsidiary of NGK Insulators, Ltd. supplies its products to North American automakers and global markets.
Based in Cleveland, OH, Stainless Works manufactures high-performance automotive exhaust systems. They specialize in US-made headers, catback systems, and complete exhaust kits for a range of performance vehicles. Their products cater to popular models such as the Ford Raptor R, Cadillac CT5-V Blackwing, and F-150.
US Convertors manufactures high-quality catalytic converters, including manifold, universal, and direct-fit types. The company leverages global manufacturing capability, automated technology, and CAD-driven engineering to provide competitive pricing and OEM-grade products. They serve automotive, light-duty, medium-duty, and heavy-duty markets.
Based in Naches, WA, Airflow Catalyst Systems Inc. manufactures specialized emissions control solutions for diesel, natural gas, and propane engines. The company provides catalytic converter systems tailored for demanding industrial applications, particularly within the mining and marine sectors. They focus on delivering robust, custom-engineered solutions.
Cummins Inc. based in Columbus, IN, specializes in designing and manufacturing advanced aftertreatment systems, including catalytic converters. These technologies are crucial for optimizing fuel efficiency, ensuring performance, and meeting emissions regulations for their diverse range of engines and power solutions.
NGK Automotive Ceramics, U.S.A. Inc. provides high-performance components for emission control systems. This subsidiary supplies major automobile and heavy-duty diesel manufacturers with essential parts like ceramic substrates for catalytic converters, including their HONEYCERAM® catalyst support, and diesel particulate filters.
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PGM (Platinum Group Metals) like platinum, palladium, and rhodium are the primary active ingredients in catalytic converters. Their market prices fluctuate daily based on global supply and demand, geopolitical events, and even investor speculation. This volatility directly impacts the material cost, which can be 70-80% of a converter's total price. Experienced manufacturers often employ hedging strategies, fixed-price contracts for specific periods, or offer consignment programs for PGMs to mitigate risk for their buyers. Always discuss their PGM procurement and pricing mechanisms upfront to understand potential cost variations.
The substrate is the internal honeycomb structure coated with the washcoat. Ceramic substrates (typically made of cordierite) are common, cost-effective, and provide good thermal insulation, but can be brittle and susceptible to thermal shock. Metallic substrates (made of stainless steel foil) offer higher thermal shock resistance, faster light-off performance, and greater design flexibility (allowing for thinner walls and higher cell density for increased surface area) but are typically more expensive. The choice depends on your application's exhaust gas temperature, flow dynamics, vibration levels, space constraints, and target emissions performance. High-performance or heavy-duty industrial applications often benefit from metallic substrates due to their durability and efficiency.
For road-going vehicles in the US, compliance with EPA (Environmental Protection Agency) and CARB (California Air Resources Board) standards is paramount. This includes demonstrating that their converters meet specific emissions reduction targets and pass extensive durability tests (e.g., 50,000 or 100,000-mile equivalent testing) to maintain performance over time. For automotive OEM programs, an IATF 16949 quality management system is often a mandatory requirement. For off-road or industrial applications, specific EPA Tier standards (e.g., Tier 4 Final) or local air quality regulations will dictate the necessary performance and testing protocols. Always confirm the manufacturer's experience and track record with the specific regulations relevant to your end market.