Best High Flow Catalytic Converters 2021 Reviews

The construction of vehicles is such that there are gases that are released while the motor is running. These gases can lead to air pollution and need to be controlled by catalytic converters. A catalytic converter has an encased honeycomb structure made of ceramic or metal and can withstand a tremendous amount of heat. As the motor runs, waste gases are emitted through the converter, where the catalysts convert the gas into a less toxic form of non-toxic vapor.

For enhancing the performance of your vehicle, high flow catalytic converters can be a great option. These upgraded converters can boost the horsepower of your vehicle’s engine. While we have compiled a list of the ten best converters on the market, please bear in mind that California residents have to adhere to stricter emissions regulations. This list may not apply to your area.

10. Tuningsworld Universal

Tuningsworld Universal

Made of stainless steel, the Tuningsworld universal catalytic converter is high flow and high-temperature resistant. This part is 100% factory tested to have a long service life and reliable quality to provide stable performance for your car’s engine. The high flow design enhances your vehicle’s power and performance by providing more oxygen to the engine. Made to fit most vehicle makes and models with an exhaust pipe that is 2.5″ in diameter. Also, the Tunighsworld Universal converter can be used for vehicles manufactured before. The item can only be used for those cars and trucks built from 1999 and require an O2 port.

9. AUTOSAVER88 High Flow Jeep Patriot/Compass Dodge Caliber

AUTOSAVER88 High Flow Jeep Patriot/Compass Dodge Caliber

The AUTOSAVER88 High Flow Catalytic Converter is made of stainless steel with an internal honeycomb structure to ensure maximum flow. This design provides the catalysts to react with exhaust gases without affecting the flow rate of the engine. This will reduce back pressure and increase the overall horsepower of your car. It is manufactured with a bolt-on connection, flange to flange. The manufacturer claims that this design allows for direct installation to your vehicle’s existing exhaust system with any additional modification. The mounting gasket and hardware are included when this item is purchased. However, this part is specifically made for Jeep Patriots, Jeep Compass, and Dodge Caliber vehicles only. Customers have complained that the fit was not 100% exact, and slight alterations were necessary to complete the installation.

8. Flowmaster Universal

Flowmaster Universal

This universal catalytic converter from Flowmaster is a high-quality converter that is manufactured in the United States. The stainless steel outer shell provides high-level durability, and the internal precious metal and substrate materials enable maximum efficiency. Please note that this catalytic converter may require fabrication or welding during installation, and therefore the manufacturer recommends that a qualified auto mechanic or technician install it. Made to fit most vehicle makes and models. However, not all customers agree with the manufacturer regarding quality and have complained of the item deteriorating rather quickly after installation.

7. AUTOSAVER88 High Flow Rav4

AUTOSAVER88 High Flow Rav4

At number seven is the AUTOSAVER88 High Flow for the RavThe stainless steel outer shell provides maximum durability. Simultaneously, the internal structure is specifically designed to prevent MIL code issues and provide the highest efficiency possible for your vehicle. The honeycomb internal features counteract the gas emissions and provide a better flow for your Rav4 engine to improve overall performance. This product is made for Rav4 models only. Still, customers have seen different results regarding the quality of the manufacturing and the overall fit of the item on their existing vehicles.

6. AUTOSAVER88 ATCC0018 Universal w/ O2 Port and Heat Shield

AUTOSAVER88 ATCC0018 Universal w/ O2 Port and Heat Shield

The new AUTOSAVER88 ATCCOO18 Universal converter boasts an improved design that can exceed the OE performance standard without affecting the quality of flow within the motor. A universal fit for most makes and models, this ATCC0018 is comprised of a round stainless steel outer casing with a ceramic casing. Overall, customers are generally satisfied with this converter and have only cautioned consumers to ensure to obtain the correct size for your specific vehicle when purchasing this item.

5. AUTOSAVER88 ATCC0063 Nissan and Infinity

AUTOSAVER88 ATCC0063 Nissan and Infinity

Midway through the list at number five is the AUTOSAVER88 ATCCOOThisconverter, specifically designed with a heavy-duty stainless steel outer layer surrounding a ceramic interior. The manufacturer created this item to ensure the highest and most efficient performance of your vehicle. Bear in mind, however, that this item, although very high quality, will only fit the exhaust pipes of the below list of vehicles:

NISSAN (Passenger Side)

  • 2007-2013 Nissan Altima 3.5L
  • 2009-2014 Nissan Murano 3.5L
  • 2013-2015 Nissan Pathfinder 3.5L
  • 2011-2017 Nissan Quest 3.5L

INFINITI (Passenger Side)

  • 2013 Infiniti JX35 3.5L
  • 2014-2015 Infiniti QX60 3.5L

4. Shaman Equipment AllFlow

Shaman Equipment AllFlow

Although included on our list of catalytic converters, this automotive part is actually not a converter at all. Although it mimics the look of today’s standard emissions converter, the AllFlow is actually a straight pipe that can be used to test a car or truck’s emissions or be installed in vehicles that were manufactured before 1975 when converters were not included as a standard in motor vehicle production. Overall, customers were quite satisfied with the fit and overall performance of this item.



On our list at number three is another universal part from AUTOSAVERThispart has a four-inch diameter inlet/outlet to fit those vehicles with a four-inch diameter exhaust pipe. The length of this converter is just over eleven inches and is perfect for those cars and trucks that were manufactured after Containing a stainless steel outer shell encasing a ceramic interior; this item may need to be welded into place, so the manufacturer recommends to have the part installed by a professional mechanic. Consumers who purchased this item commented on the easy installation of this item to their vehicles.



This converter comes with the same stainless steel and ceramic design as our previously listed items. However, this converter is a standard 2.25 inch inside diameter with a 13-inch overall length. It is universal for vehicles that contain a 2.25-inch outer diameter exhaust pipe that was manufactured in the year 1996 or after. This part is backed by a 5 year or 50,000 miles limited warranty. Customers are stating this is a great buy for the price as the installation was simple, and the item’s fit was as described by the manufacturer.



Our number one converter is the AUTOSAVER88 ATCCIt has been created with the manufacturer’s standard stainless steel covering of a ceramic internal substrate for maximum performance. This part is universal for vehicles with a 2.5-inch standard diameter exhaust pipe and measures 11 inches in length. This product is also compliant for those cars and trucks manufactured after 1995 and is also backed with a warranty covering five years of up to 50,000 miles. The AUTOSAVER88 is the most versatile of the converters we have on this list. It’s quality make this item the best overall purchase for consumers.