Ideally, the combustion process in an engine should produce steam and carbon dioxide, but this isn’t always the case, because of hot temperatures and gases such as nitrous oxides and carbon monoxide are formed. These gases are very dangerous to the environment. With the best high-flow catalytic converters, it will help by reducing the number of toxic gasses emitted into the environment while improving the performance of the vehicle. If your car does not have a catalytic converter, you can face fines in some states.
In this article, we have done some research and come up with the top 10 best high-flow catalytic converters that can work effectively to help your car pass an emissions test.
List of Top 10 Best High Flow Catalytic Converters in 2023
#10. AUTOSAVER88 ATCC0017 2.25 inches EPA Compliant
AUTOSAVER88 is one of the finest catalytic converter brands in the market. It has a shell made of stainless steel, making it durable and long-lasting. Ideally, this universal Catalytic Converter features a standard 2.25 inches inside diameter inlet/outlet, and it is carefully engineered to avoid MIL code issues and to ensure maximum efficiency. In addition to that, this high-flow converter is made to meet and exceed OE performance and quality standards without sacrificing the flow rate.
Other than that, this Catalytic Converter is designed to use in OBD II compliant with mostly includes 1996 and newer vehicles. Lastly, the product is backed with a free 50,000 miles or 5 years limited warranty.
- Heavy-duty stainless steel construction
- Ideal for vehicles with 2.25 inches diameter exhaust pipe
- Exceed OE quality and performance standards
- Backed five years limited warranty
- Improve vehicle performance
- 13″ overall length.
#9. AUTOSAVER88 ATCC0010 EPA Compliant 3 inches
This catalytic converter is manufactured for OBD II-compliant models. It is a universal fit catalytic converter that is made to meet or exceed OE quality performance without sacrificing flow performance. Ordinarily, this product is made using high-quality stainless steel. The catalyst coating and the internal ceramic substrates are carefully engineered to ensure maximum efficiency. Other than that. The product has received Genuine EPA certification, and each Catalytic Converter is being stamped with an exclusive EPA number.
The catalytic converter has a standard 3 inches inside diameter inlet and outlet and has 11 inches overall length. The model is backed with five years of limited warranty and installation requires welding and cutting. Therefore, you should consider professional operation.
- Fit 3 inches outer diameter exhaust
- Genuine EPA certification
- Carefully engineered for maximum efficiency
- Backed 50,000 miles or 5 years limited warranty
- Offer great performance without sacrificing flow rate.
#8. FOMIUZY 2.5 Inch Inlet/Outlet Universal High Flow
The Kooks Custom Catalytic Converter is going to give your vehicle more than a 90% reduction in hydrocarbon emissions. It works perfectly on both supercharged and turbocharged, and it is ideal for Naturally Aspirated. In addition to that, this Catalytic Converter has an Outlet Diameter of 3 inches, and it is made using high-quality materials; thus, it will serve you for many years to come. On the other hand, this product is designed to match rigorous quality standards, and it is going to meet your needs.
This excellent product comes at a very affordable price and will deliver great quality. Moreover, it is going to eliminate all the carbon and soot deposits that are built up in the fuel system. And yes, the end results will be a clean oxygen sensor and catalytic converter. With that, it will increase fuel efficiency.
- Catalytic Outlet Diameter: 3 inches
- Comes at a budget-friendly price
- Applications up to 900 HP
- Designed to match rigorous quality standards
- Handles Exhaust temp up to 1500F
- Works on both Supercharged and Turbocharged.
#7. AUTOSAVER88 ATCC0006 2.5 inches EPA Compliant
AUTOSAVER88 has been propelling in producing a high-quality Catalytic Converter that meets all the OE quality without sacrificing flow rate. It is designed to minimize the amount of emitted gasses in the atmosphere. It also decreases the backpressure that comes from the exhaust, thereby improving your car’s performance. Featuring standard 2.5 inches inside diameter inlet/outlet, this Catalytic Converter will fit universal vehicles with a 2.5” outer diameter exhaust pipe.
The Catalytic Converter has a Genuine EPA certification, and each catalytic converter body is usually stamped with an EPA number. Lastly, the Catalytic Converter has been carefully engineered to ensure maximum efficiency.
- Standard 2.5″ inside diameter inlet and outlet
- Meet OE quality and performance standards
- Genuine EPA certification
- Backed five years warranty
- OBD II compliant
- Engineered for maximum efficiency.
#6. MagnaFlow 99006HM Catalytic Converter
The MagnaFlow 99006HM catalytic converter is made from high-quality stainless steel, and it has its own heat shield. This item is made in the U.S.A. and can be easily installed in most vehicles. However, it is not legal for sale, use, or installation in vehicles registered in California. Moreover, it is formulated for diesel and gas applications and meets all the EPA requirements. This Catalytic Converter has an Inlet Diameter of 2.5 inches and the main piping diameter of 2.5 Inches.
Installation of these universal converters requires the usage of cutting, welding, and tube bending equipment that are accessible to most expert installers. This unit is very sturdy and durable, and it has a heat shield that included ensuring durability while preventing heat damage to the vehicle floor and other parts.
- 5 inches converter inlet diameter
- Federal emissions-compliant design
- Stainless steel construction
- Meet EPA requirements
- Formulated for diesel and gas applications.
#5. AUTOSAVER88 ATCC0021 EPA Compliant 4 inches Inlet/Outlet
AUTOSAVER88 ATCC0021 4 inches is a relatively affordable catalytic converter that is made to universally fit pieces for cars manufactured in 1996 and newer vehicles. The whole structure is constructed using heavy-duty stainless steel construction while it is catalyst coating and internal ceramic substrates have remained carefully made for maximum efficiency. Other than that, this unit has a standard 4 inches inside diameter inlet and outlet that is universal for cars that have a 4” outer diameter exhaust pipe.
The unit comes with five years or 50,000 miles warranty assuring you great performance and free replacement in case you find any manufactures error. However, this converter is not CARB-approved; thus, it cannot be used in California.
- 4″ inside diameter Inlet/Outlet Diameter
- Stainless Steel body materials
- Universal Fit Converter Type
- Honeycomb structure for maximum flow
- Have increased exhaust flow
- OBD II compliant.
#4. Pair 2.5 inches Universal Spun High Flow Catalytic Converter
The Pair 2.5 inches High Flow catalytic converter is an adaptable component that fits multitudes of applications as it is OBDII compliant hence it can be utilized for newer vehicles. It features an inlet and outlet diameter of 2.5 Inches and has a body length of 4 Inches. Apart from having a universal design, this Catalytic Converter is compatible with both diesel and gas engines making it one of the few converters that usually work with diesel engines.
On the other hand, the main material used in construction is stainless steel, and it has seams welded close to the body of the converter in order to create a sturdy structure that will withstand vibrations and bumps as the vehicle moves. Remember that some cutting and cutting may be required during installation.
- Fits tight applications
- 5 to 10 horsepower increase
- 5 inches inlet/outlet diameter
- Zero leakage
- OBDII compliant excluding California emissions
- 400 CPI ceramic brick for engines up to 5.9l
- Spun design.
#3. AUTOSAVER88 ATCC0018 EPA Compliant 2.5 inches
This stainless steel cart is compliant with federal gas emissions regulations. It is a universal fit catalytic converter that has a standard 2.5 inches inside diameter inlet and outlet with 15 inches overall length. The unit is going to help to reduce corrosion and enhances the fuel conversion rate. In addition to that, this Catalytic Converter has a genuine EPA certification with every converter body stamped with exclusive EPA numbers.
Subsequently, the improved flow rate of this Catalytic Converter will improve your vehicle performance by decreasing fuel consumption and increasing horsepower. In addition to that, it is going to protect your vehicle engine from overheating while eliminating foul exhaust pollutant gases.
- Heavy-duty stainless steel construction
- OBD ii compliant
- Standard 2.5 inches inside diameter inlet/outlet
- Carefully engineered for maximum efficiency
- Designed to meet or even exceed OE quality.
#2. MagnaFlow 99206HM Universal High Flow Catalytic Converter
Next in our list is the MagnaFlow 99206HM Catalytic Converter. It has an inlet diameter of 2.5 inches, and it is formulated for diesel and gas applications. The actual reduction-and-oxidation is usually done inside the honeycomb structure, and it is constructed using stainless steel shell that will protect all the internal components from damage, this makes this unit durable and long-lasting. Moreover, for additional toughness, this item has seams welded close to the body of the converter resulting in a firm and tight structure.
One benefit of this Catalytic Converter is that it fits in any vehicle exhaust system while converting harmful gases into safe ones for the environment. Besides the unit meet EPA requirements; however, it is not legal for use, installation, or sale in the state of California.
- Stainless steel construction
- Formulated for diesel and gas applications
- The seam welded close to the converter body
- Federal emissions-compliant design
- Converter inlet diameter: 2.5 inches
- Meet EPA requirements.
#1. AUTOSAVER88 Direct-Fit High Flow Catalytic Converter (EPA Compliant)
The AUTOSAVER88 Catalytic Converter is crafted from high-quality stainless steel, catalyst coating, and internal ceramic substrates that have been carefully engineered to ensure maximum efficiency. If you own a 2.8L/3.6L 2004-2007 Cadillac CTS Base, then this is the best-fit converter for your vehicle. Other than that, the item comes with hardware and mounting gasket for the flange to flange, bolt-on connection, and direct installation to the existing exhaust system without doing a lot of modification.
Ideally, this Converter is made to meet and exceed OE quality without sacrificing the flow rate. Moreover, the item is backed with 50,000 miles or five years limited warranty.
- Heavy-duty stainless steel construction
- Genuine EPA certification
- Carefully engineered for maximum efficiency
- Offer great performance without sacrificing flow rate
- Backed five years limited warranty.
Factors to Consider When Purchasing the Best High-Flow Catalytic Converters:
- Types of Catalytic Converters – There are three main types of high-flow catalytic converters. These are diesel, two-way, and 3-way catalytic converters. For diesel engines, the catalytic converters have a Diesel Oxidation Catalyst inside that will oxidize unburnt hydrocarbons and carbon monoxide to water and carbon dioxide. A 2-way catalytic converter, it is the same as a diesel catalytic converter, but it performs the 2 functions. 3 Way catalytic converter is much better as they offer a complete alteration of harmful exhaust to friendly gases.
- Fit – This is another essential factor that you need to take into consideration. There are Universal Fit and Direct Fit converters. Universal Fit converter is made to fit in most exhaust systems while the direct-fit converter is designed for specific types of vehicles. They only require to be bolted into the exhaust system whenever you are doing the installation.
- Durability – A good-performing high-flow catalytic converter should be durable in order to give you value for money while it will serve you for a long time. Though most of them are crafted from stainless steel, you should look at whether the item comes with a warranty.
- Brand – In the same way you prefer to buy a vehicle from a well-known brand, it is likewise very essential to purchase a high-flow catalytic converter that comes from a well-known brand. All the products listed below come from trusted brands.
Conclusion
With all of this said modern catalytic converters do not impose any sort of exhaust restriction. If you feel to replace your vehicle catalytic converter, then try one of the above-listed brands. All of them are trusted manufacturers and make converters using the best materials to ensure supreme performance for your vehicle. It seems that the AUTOSAVER88 brand is the top manufacturer on the market at the moment. Therefore, improve your vehicle performance and eliminate emissions by buying one of the above high-flow catalytic converters.