Advanced Exhaust Solutions supplies and designs custom exhaust systems, including gas silencers, piping, and after-treatment components. They offer integrated emissions-compliant solutions tailored to unique client applications. The company serves industrial sectors such as power generation, oil and gas, marine, locomotive, construction, and off-road markets.
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Exhaust System Manufacturers
Last updated: January 2026
This directory lists 76 exhaust system manufacturers across the United States, from high-volume OEM integrators to specialized custom fabrication shops.
Buyers frequently seek solutions for challenging thermal management, achieving specific noise attenuation targets, or integrating advanced emissions control technologies like Selective Catalytic Reduction (SCR) systems or Diesel Particulate Filters (DPF). The right manufacturer solves problems related to exhaust gas flow optimization, ensuring compliance with strict EPA and CARB emissions standards, and managing the weight-to-durability ratio for critical applications.
Supplier types in this sector range significantly. You'll find large-scale Tier 1 suppliers specializing in full catalytic converter canning and complete system integration for automotive OEMs, smaller job shops focused on intricate custom headers or performance exhaust components, and even niche providers skilled in aftermarket solutions for specific vehicle platforms. Distinguishing them often comes down to their typical production volumes, material specializations, and engineering support capabilities.
When engaging these manufacturers, buyers should arrive with clear specifications including required material grades, target back pressure, acoustic performance metrics, and any specific assembly requirements. Suppliers will expect detailed CAD models, material certifications, and ideally, a preliminary understanding of the intended duty cycle and environmental exposure, allowing them to accurately quote and propose appropriate manufacturing processes.
A significant trend in the exhaust system manufacturing category is the increasing demand for lightweighting solutions and advanced material usage, particularly for electric and hybrid vehicle applications where exhaust systems play a different, but still critical, role in thermal management for batteries and power electronics. We're also seeing more focus on modular designs to reduce complexity and assembly time.
Company Directory
76 companies nationwide
Based in Fort Lauderdale, FL, Aircraft Exhaust Corp. manufactures aircraft exhaust systems and components. They serve OEMs and aircraft owners as a single-source supplier, emphasizing quality workmanship, premium materials, and adherence to stringent industry standards. The company is dedicated to innovation and customer satisfaction.
American Eagle Exhaust manufactures and supplies 100% stainless steel exhaust kits for Class 8 trucks in North America. Specializing in pure performance exhaust systems, they offer various 7", 8", and 10" stack designs, elbows, and components. The company provides solutions for Peterbilt, Kenworth, and Freightliner trucks with fast service.
Based in Mount Vernon, OH, AMG Industries specializes in custom precision metal manufacturing for high-performance exhaust components. They offer comprehensive services including welding, metal stamping, laser cutting, fabrication, and assembly, serving automotive OEMs and other industrial clients.
Based in Clive, IA, Auto-jet prototypes and manufactures exhaust system parts and accessories for a diverse range of vehicles. With over 60 years of experience, the company serves aftermarket school bus, truck, off-road, and OEM clients. Auto-jet is ISO 9001:2015 certified for its quality manufacturing processes.
Based in Eagan, MN, Aerospace Welding Inc. was established in 1993. The company specializes in manufacturing exhaust systems for general aviation aircraft. They also provide repair services for aircraft engine mounts, serving the aerospace industry with their in-house capabilities.
Based in Johnson City, TN, Borla manufactures high-performance exhaust systems for various automotive applications. The company engineers advanced stainless steel exhaust solutions with diverse sound levels, focusing on quality, durability, and enhanced vehicle performance. Borla serves the aftermarket automotive sector.
Based in Costa Mesa, CA, Burns Stainless manufactures high-performance exhaust components and systems. They specialize in US-made, mandrel-bent stainless tubing, bends, collectors, and racing mufflers. Serving professional race teams in NHRA, IMSA, and V8 Supercars, their products are also supplied to high-end fabricators.
Based in Germantown, WI, Cain Industries manufactures exhaust heat recovery and steam generator systems. The company specializes in combustion exhaust heat transfer products, offering boiler economizers, waste heat recovery systems, and heat recovery silencers for engine cogeneration and industrial heat applications.
Caliber Customs provides high-performance engineering and fabrication services, specializing in custom exhaust systems. They offer hand-fit and blended joints, back-purged with argon, alongside engine builds, swaps, and comprehensive fabrication from aluminum to titanium for various vehicle applications.
Carven Exhaust is a US-based manufacturer specializing in hand-crafted exhaust systems. The company produces mufflers, tips, and cat-back systems for trucks and cars, built in-house with no outsourcing. All products are made to order, focusing on performance and sound.
Based in Thomasville, GA, Centek Marine manufactures custom marine exhaust systems and mufflers. Specializing in engineered solutions for superyachts and other marine vessels, the company has been providing durable exhaust components since 1962.
Megs Exhaust Warehouse manufactures aftermarket exhaust systems for automotive, motorcycle, and marine applications. Established in 1970, the company specializes in high-quality fabrication of custom exhaust components and complete kits, serving the aftermarket industry.
Based in Buffalo, MN, D'Shannon Aviation specializes in the design and manufacture of high-performance exhaust systems. The company develops advanced systems aimed at increasing the power and efficiency of aircraft engines, serving the aviation industry with proprietary solutions.
D&D Performance Exhaust manufactures high-performance exhaust systems for a range of motorcycles, including Harley Davidson, Polaris, and Victory models. The company produces various exhaust pipes, slip-ons, and full systems. It is recognized for its commitment to product quality and customer service.
Dinex Emission Inc. specializes in the manufacturing of heavy-duty aftermarket exhaust and emission systems. Their solutions are engineered with the latest technologies, designed to reduce harmful pollutants. The company produces high-quality systems for various industrial and commercial applications across North America.
Based in Detroit, MI, Duravent Group is a climate technology leader specializing in venting and air control systems. The company manufactures comprehensive solutions for residential and commercial applications, including exhaust systems for various by-products. They serve professionals, homebuilders, installers, GCs, architects, and engineers.
Based in Rancho Cucamonga, CA, Eddie Marine, Inc. manufactures engine exhaust systems for marine applications, including the EMI Thunder Exhaust. They specialize in cast aluminum manifolds and risers for Big Block Chevy engines. The company also offers a variety of billet aluminum marine accessories.
FAB28 Industries is a Southern California-based manufacturer specializing in custom, hand-built performance exhaust systems for high-end European vehicles. The company crafts exhausts using domestically sourced stainless steel, focusing on meticulous craftsmanship and quality, and offers both custom and production solutions.
Based in Ukiah, CA, Factory Pipe, LLC designs and builds exhaust systems for the motorsports industry. The company operates as an OEM supplier, providing comprehensive fabrication services to engineer and produce custom exhaust solutions for clients.
FMF Racing is a US-based manufacturer specializing in high-performance exhaust systems for dirt bikes and ATVs. Founded in 1973, the company designs and produces mufflers and exhaust parts focused on precision, power, and speed for the powersports industry.
Based in Corona, CA, Freedom Performance Exhaust manufactures 100% American-made motorcycle exhaust systems and components. They specialize in high-performance exhaust for Harley-Davidson and Indian motorcycles, offering products like slip-ons, mufflers, and end-caps.
Based in Bensalem, PA, Global Emissions Systems Inc. designs, develops, and manufactures advanced emissions control solutions. The company provides tailored exhaust systems primarily for internal combustion engine applications across power generation, on-road, and off-road heavy-duty markets.
Based in Corona, CA, Gibson Performance Exhaust manufactures high-performance exhaust systems. They offer a range of products including mufflers, headers, and tips for trucks, SUVs, UTVs, American muscle cars, and marine applications.
Grand Rock Exhaust Systems is a U.S. manufacturer specializing in commercial vehicle exhaust components. Based in North East Ohio, the company produces its product line using American-made steel. They offer exhaust pipes, bushings, and coolant tubes for heavy-duty trucks like Peterbilt and PACCAR, and for school buses.
Based in Newberg, OR, Harco Manufacturing produces specialized exhaust systems and accessories. They focus on engine generator exhaust systems for attenuated enclosures, marine engine exhaust systems, and components for ISO containers for emergency power. Products include spark arresting exhaust accessories and marine-grade thimbles.
Based in Akron, OH, Harvey Industries specializes in the manufacturing of custom exhaust extraction systems. With 78 years of expertise, the company provides tailored solutions and professional site evaluations nationwide, serving industrial and commercial clients.
HDI Marine engineers and manufactures custom stainless steel exhaust components for marine applications. The company specializes in boat exhaust parts, offering products like straight mixers and Detroit Diesel replacements. They provide worldwide shipping and back their products with a 30-day satisfaction and a 3-year manufacturer's warranty.
Based in Norcross, GA, Heavy Duty Manufacturing Inc. provides quality exhaust components for the heavy-duty industry. With over thirty years in aftermarket truck exhaust, the company focuses on delivering dependable service, excellent coverage, and quality products at competitive prices for commercial vehicles.
Based in Fairhope, AL, Marine Exhaust Systems of Alabama, Inc. manufactures a wide variety of exhaust system components. They specialize in producing marine manifolds, heat exchangers, and custom components for both marine and non-marine industries.
Based in Marysville, WA, National Marine Exhaust, Inc. specializes in manufacturing custom stainless steel marine exhaust systems. The company produces a variety of marine exhaust products, offering custom solutions designed to improve engine mileage and extend engine life, utilizing processes like water jet cutting.
Based in Oklahoma City, Nicrocraft manufactures FAA-certified aircraft exhaust systems and parts. They produce mufflers, risers, stacks, and shrouds for various aircraft including Cessna, Piper, and Beechcraft, focusing on durable and safe flight components.
Based in Hatfield, PA, Pypes Performance Exhaust manufactures complete mandrel bent, performance exhaust systems. They cater to American performance vehicles, covering models from the 1950s to the present day.
Sanderson Headers, located in South San Francisco, CA, is a US manufacturer specializing in high-quality headers and exhaust system components. With over 60 years of experience, they build and install solutions for a wide range of vehicles, emphasizing patented technology, precise fit, and performance using 16-gauge tubing.
Seaboard Marine, serving Ventura County, California, specializes in custom marine exhaust system design and fabrication. The company also provides marine repower services, custom boat building, and supplies equipment and parts, focusing on Cummins Marine engines and ZF Marine Transmissions.
Based in Lake City, MN, Stainless Headers Mfg specializes in hand-crafting performance exhaust systems and components. They offer custom oval exhaust parts, mufflers, large diameter bends, and turbo headers made from American 304 Stainless Steel and Titanium. The company provides custom fabrication for one-off parts and complete production runs.
TruckPipesUSA specializes in manufacturing and supplying a wide range of exhaust pipes and components for heavy-duty semi trucks. Their product line includes DOC filters, mufflers, elbows, clamps, and various rubber components, all proudly made in the USA, serving the commercial vehicle industry.
Valvetronic Designs manufactures high-performance valved exhaust systems for luxury and sports vehicles. They offer custom solutions, allowing drivers to switch between loud and quiet modes at the touch of a button. The company produces complete exhaust systems and universal muffler kits for popular models from BMW, Audi, and Chevrolet.
Vance & Hines manufactures high-performance exhaust systems, specializing in motorcycle applications. Based in Santa Fe Springs, CA, they engineer and produce Cat-Back Performance Exhaust Systems and related Stage 1 upgrades. The company leverages over 40 years of racing heritage, with all products proudly made in the USA.
Voodoo Design manufactures high-performance exhaust systems and components for exotic car brands like Ferrari, Lamborghini, and Porsche. Based in Nashville, TN, the company utilizes precision engineering, in-house fabrication, and advanced manufacturing techniques including CAD modeling and TIG welding to ensure superior fitment, durability, and a signature sound.
Based in Monroe, MI, Walker Exhaust Systems manufactures performance-grade mufflers and complete exhaust kits. The company produces OE-quality exhaust components for a diverse range of vehicle makes and models, serving both original equipment and aftermarket needs with specialized parts.
Based in Highland, MI, B2 Fabrication manufactures premium aftermarket exhaust and muffler systems. The company produces quality, American-made parts for cars and trucks, with applications for popular models like Ford F-150 and Toyota Tacoma. B2 Fabrication focuses on high performance, sound, and overall product quality.
Based in New Bedford, MA, Davico Manufacturing specializes in producing direct fit catalytic converters and a wide range of exhaust products. The company offers over 4,000 direct fit converters and 500+ exhaust products for import and domestic cars, light trucks, and vans, leveraging its catalyst technology and manufacturing expertise.
Mammoth Equipment is a family-owned manufacturing company specializing in exhaust, thermal, air intake, and emission control products and solutions for heavy-duty diesel equipment. Founded in 1974, the company delivers integrated solutions to industries globally, including mining, with 18 locations worldwide and a presence in the United States.
The Muffler Man specializes in manufacturing custom exhaust systems, offering options from full dual stainless steel tig welded systems to cost-effective pinch-bent aluminized systems. They possess the capability to build any type of exhaust system, tailored to fit specific requirements.
Based in Riverside, CA, SpinTech Performance Mufflers specializes in manufacturing high-performance exhaust systems. They produce race and street mufflers, along with oval tubing, utilizing proprietary spin trap and venturi port technologies for enhanced gas flow. Products are proudly made in the U.S.A.
Based in Charlevoix, Michigan, ACAT Global manufactures direct-fit catalytic converter systems for various vehicle makes and models, including Ford, Toyota, and Subaru. They specialize in metallic core designs, producing EPA-compliant units in the USA for automotive aftermarket applications. The company offers a limited lifetime warranty on its exhaust emission control products.
Based in Goldsboro, NC, AP Emissions Technologies specializes in manufacturing aftermarket exhaust and emissions parts. The company supplies a wide range of products for on-road and off-road passenger vehicles, fleets, and both light and heavy-duty commercial vehicles, offering performance catalyst technologies.
Barr Marine manufactures replacement manifolds, risers, and other marine hardware. The company specializes in producing essential components for marine exhaust systems, including manifolds and risers, alongside a range of inboard marine engines. They provide critical parts for the maintenance and repair of marine vessels.
Brock's Performance, based in Dayton, OH, designs and manufactures high-performance exhaust systems. They focus on delivering significant power gains, substantial weight savings, and exclusive styling. Their products are engineered for various demanding applications, catering to performance enthusiasts and specialized vehicle requirements.
Based in Bloomer, WI, Catalytic Combustion Corporation designs, develops, and manufactures emission control equipment for a broad range of industries. They provide systems and catalysts to remove harmful substances and noise from process exhaust, serving large manufacturers and power generation operations.
Coffman's Exhaust Systems manufactures high-quality motorcycle exhaust systems, with over 40 years of experience. The company offers custom laser-engraved designs, including their Blacked Out Edition, for models such as Honda, Kawasaki, Suzuki, and Yamaha. They provide affordable, durable exhaust solutions.
Based in Columbus, IN, Cummins manufactures global aftertreatment systems and technologies. The company serves OEMs and customers, providing solutions designed to meet or exceed emissions regulations for various applications.
Based in Baton Rouge, LA, DC Sports manufactures custom-made performance exhaust systems and components for various automotive applications. Their product line includes triple exit exhausts, front pipes, mid pipes, headers, and exhaust valve controllers designed for enhanced power and sound.
DeAngelo Marine Exhaust specializes in manufacturing marine exhaust systems for yachts, boats, and commercial and military vessels. The company provides custom stainless and aluminum fabrication services, alongside diesel generator soot filtration solutions such as SeaClean.
DG Custom Headers manufactures race headers and custom exhaust systems, backed by over 30 years of experience. They build high-performance components for road race, muscle cars, and street rod applications. Their products are proven at competitive events, including Bonneville, IHBA, SCCA, and USAC.
Diamond Eye Performance manufactures durable diesel and gas exhaust systems, proudly made in the U.S.A. The company specializes in performance exhaust products, offering over 40 C.A.R.B. approved kits. These systems are legal in all states and fit various vehicle brands.
Based in Bloomington, MN, Donaldson Company provides exhaust systems, components, and accessories for medium and heavy-duty diesel-powered equipment. The company also specializes in advanced filtration solutions for engines, hydraulics, and various industrial applications, serving industries like construction, manufacturing, and transportation.
G-Sport by GESi manufactures high-performance catalytic converters designed for vehicles up to 1200 horsepower. These advanced exhaust system components ensure EPA compliance while delivering superior performance. The company focuses on engineering quality and adherence to regulatory standards for powerful automotive applications.
Based in Paso Robles, CA, Lemons Headers manufactures custom-fit performance headers and exhaust systems. Established in 1997, the company offers custom design and high-quality craftsmanship, specializing in handcrafted headers for Chevy vehicles. With over 25 years of experience, they are a trusted name in the auto industry.
Based in Lake Elsinore, CA, Lightning Headers specializes in the manufacturing of marine exhaust systems. The company produces boat headers, marine exhaust components, and rail kits, catering to specialized boat and marine applications.
Based in Oceanside, CA, MagnaFlow manufactures performance exhaust systems, mufflers, custom builder parts, and catalytic converters. The company offers replacement exhaust solutions and products built to OE design, serving automotive upgrade needs directly.
Based in Riviera Beach, FL, Marine Exhaust Systems specializes in manufacturing custom marine exhaust risers, elbows, mufflers, and fiberglass exhaust products. They also supply exhaust hose, clamps, and accessories, serving the marine industry with comprehensive exhaust solutions for various vessel requirements.
Based in Marshfield, MO, Paradox Performance Company manufactures USA-made exhaust system components. They utilize patented Tuning Fork Technology to produce universal mufflers, direct fit exhaust kits, and Y-pipes for various vehicles. Their products deliver aggressive, deep sound, eliminate exhaust drone, and optimize exhaust flow.
Doug's Headers, a brand under PerTronix Performance Brands, specializes in manufacturing high-quality headers for the automotive aftermarket. Established in 1958 as a muffler shop, it has a long history in the exhaust industry, producing performance exhaust components for various classic and modern vehicles.
Based in Bradenton, FL, Plastec Ventilation manufactures high-quality, corrosion-resistant polypropylene fans and blowers. Specializing in fume blowers and fans for demanding extraction systems, the company primarily serves laboratories and other industrial applications. They apply decades of experience in ventilation technology.
Based in Bettendorf, IA, Schebler Chimney manufactures prefabricated commercial chimney and exhaust systems. They specialize in factory-fabricated, built-to-order generator exhaust systems. These systems are highly engineered for maximum efficiency, longevity, and safety, providing customized solutions for diverse commercial applications.
Stainless Works designs and manufactures high-performance exhaust systems and headers, proudly made in the USA. Their products are engineered to increase horsepower and enhance engine tone for various vehicles. They offer specific systems, including headers and catback exhausts for models like the Ford Raptor R and Cadillac CT5-V Blackwing.
Teague Custom Marine, based in Valencia, CA, manufactures high-performance marine exhaust systems and mufflers. The company provides custom boat parts and accessories, delivering specialized solutions for optimal performance and durability within the demanding marine industry.
Thermal R&D Exhaust manufactures high-quality aftermarket exhaust systems and components in the U.S. The company specializes in catback and frontpipe-back exhausts, tips, resonators, and universal mufflers. They provide tailored solutions for popular vehicle models, including Ford F-150 EcoBoost, Explorer ST, Bronco, and Honda Accord.
Based in Sumter, SC, Topkote supplies portable fume and paint exhaust systems, commercial blowers, fans, and duct equipment. These systems are designed for professionals in the reglazing and refinishing industry, including bathtubs and tile. The company also provides related coating products.
Based in Corona, CA, Tube Technologies, Inc. (TTi Exhaust) manufactures high-performance exhaust systems and headers. The company specializes in crafting exhaust solutions exclusively for MoPar vehicle enthusiasts, focusing on demanding specifications for quality and performance.
US Convertors manufactures high-quality catalytic converters and other exhaust components, including manifold, universal, and direct-fit options. The company utilizes OEM-grade technology and advanced automated manufacturing processes. It supplies exhaust systems and diesel emissions solutions for automotive, light-duty, medium-duty, and heavy-duty vehicle markets.
Based in Centreville, MI, Waldron's Exhaust, Inc. manufactures OEM style exhaust systems for classic cars and trucks from the early 1900s through the 1980s. They focus on precise fit, look, and sound, building complete systems to order based on patterns and dimensional data. The company also duplicates old parts.
AcmeFan specializes in the design and supply of air movement and ventilation equipment. The company provides custom-designed ventilation solutions for a wide range of industrial and commercial markets, including those requiring robust exhaust systems.
GenExhaust.com specializes in manufacturing exhaust extension systems for generators. They provide both bolt-on and weld-on extensions, along with accessories such as quick disconnects, magnetic dipsticks, oil change tubes, and through-wall kits. Tubing options include steel and silicone, suitable for various demanding applications.
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How to Choose a Company
- Verify their experience with your specific material requirements – not all shops are proficient in welding and forming high-nickel alloys like Inconel or specific grades of stainless steel beyond basic T409.
- Assess their capability for specialized processes such as CNC mandrel bending for tight radii without crimping, hydroforming for complex shapes, or robotic welding for consistent bead quality and repeatable component fit-up.
- For automotive OEM or heavy-duty applications, ensure they hold IATF 16949 certification and can provide evidence of robust PPAP (Production Part Approval Process) documentation and adherence to specific emissions regulations like EPA Tier 4 or Euro VI.
- Scrutinize their in-house capabilities for NVH (Noise, Vibration, Harshness) analysis and acoustic tuning. Many can build, but few truly understand how to engineer for optimal sound characteristics and mitigate unwanted resonances.
- A common gotcha: Many manufacturers claim catalytic converter canning capability, but often outsource the critical washcoat application or substrate integration. Verify their direct control over the entire canning process, including quality checks for brick integrity and precious metal loading.
- Confirm their packaging and logistics expertise for large, oddly shaped exhaust components. Improper packaging can lead to damage in transit, costing significant time and money in rework and reshipment.
Supplier Types at a Glance
| Type | Best For | Typical MOQ |
|---|---|---|
| OEM Integrator / Tier 1 Supplier | Large-scale automotive or heavy-duty OEM projects requiring full lifecycle support, advanced R&D, and strict IATF 16949 compliance. | 10,000+ units/year |
| Performance & Custom Fabricator | Specialized, low-to-medium volume production for high-performance vehicles, race applications, or niche custom projects with unique material needs (e.g., Inconel). | 1-500 units/year |
| Aftermarket Volume Producer | Standardized aftermarket replacement parts or bolt-on upgrades for popular vehicle models, prioritizing cost-effectiveness and broader market appeal. | 1,000-10,000 units/year |
| Diesel Emissions Specialist | Complex exhaust systems integrating DPF, SCR, and EGR for heavy-duty diesel engines, requiring deep expertise in emissions regulations and thermal management. | 500-5,000 units/year |
Frequently Asked Questions
What's the difference between T304 and T409 stainless steel for exhaust systems, and which should I choose?
T304 is an austenitic stainless steel, offering superior corrosion resistance and a brighter finish, ideal for performance and longevity in challenging environments but is typically more expensive. T409 is a ferritic stainless steel, more cost-effective and commonly used for OEM applications, offering good corrosion resistance and heat tolerance, especially when aluminized, but it can show surface rust over time. Your choice depends on budget, aesthetic requirements, and the desired lifespan and environmental exposure of the system.
How critical is mandrel bending for exhaust performance, and when is crush bending acceptable?
Mandrel bending is crucial for maximizing exhaust gas flow. It uses an internal mandrel to support the pipe's interior during bending, preventing crimping or reduction in diameter at the bend points. This maintains consistent cross-sectional area, reducing back pressure and improving engine efficiency. Crush bending, while cheaper, significantly restricts flow due to deformation. Mandrel bending is nearly always preferred for performance or critical flow applications. Crush bending might be acceptable only for non-critical, low-performance applications where cost is the absolute primary driver and flow dynamics are irrelevant.
When sourcing catalytic converters, how do I ensure compliance with CARB or EPA emissions standards?
For CARB (California Air Resources Board) compliance, you'll need a manufacturer whose catalytic converters are specifically certified or approved for sale in California, often indicated by an EO (Executive Order) number. EPA compliance generally applies to the rest of the US. Ask manufacturers for their compliance documentation, test reports, and details on their catalyst substrates and washcoat formulations. It’s also vital to understand if the manufacturer can perform or facilitate emissions testing to validate performance against the specific vehicle class and standards required.
What information should I provide for an accurate quote on a custom exhaust manifold or header?
To get an accurate quote for a custom exhaust manifold or header, provide detailed 3D CAD models, target material (e.g., T304 stainless, Inconel), desired primary tube diameter and length, collector type (e.g., merge collector, stamped), flange specifications (port shape, bolt pattern), any clearance constraints within the engine bay, and target performance metrics like peak horsepower gains or back pressure limits. Also, specify the expected production volume and any required post-processing like ceramic coating.
What are common NVH (Noise, Vibration, Harshness) considerations specific to exhaust system design and manufacturing?
NVH in exhaust systems is often overlooked by first-time buyers. Key considerations include resonator and muffler tuning for specific frequency attenuation, proper hanger design and placement to isolate engine vibrations and prevent rattles, and flex joint selection to absorb movement and thermal expansion. Manufacturing quality, especially consistent weld beads and smooth internal surfaces, also impacts NVH. A good manufacturer will offer design input on these elements and may even have in-house acoustic testing capabilities.