Note: This article contains affiliate links. If you click on these links and make a purchase, I may earn a small commission at no extra cost to you. This helps support my research and content. Read my full affiliate disclosure here.
If you own an Infiniti FX35 and are facing reduced performance or increased emissions, choosing the right catalytic converter matters. The converter plays a central role in controlling exhaust emissions and keeping the engine running smoothly, so a correct replacement can resolve drivability issues and reduce tailpipe pollutants.This guide walks through the top shortlisted catalytic converters for the Infiniti FX35 and explains the evaluation criteria used to choose them. Read on to understand the factors that affect fitment, emissions control, and long-term reliability before you pick a replacement.
Looking for other parts? See all Infiniti FX35 parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | Walker Standard EPA 15036 Universal Catalytic Converter |  |
| Most Popular A crowd favorite that many people choose with confidence | ASOPARTS 3" Universal Catalytic Converter (3" Inlet/Outlet) |  |
| Best Quality Built to a higher standard if you want something more solid | Anytek Left & Right Catalytic Converter for Nissan/Infiniti 3.5L/3.7L |  |
| Best Budget The cheapest option that still gets the job done reliably | Yeoflagtrade 2.25" High-Flow Universal Catalytic Converter (2 pcs) |  |
| Most Sold A high-volume bestseller chosen again and again | AutoShack Driver and Passenger Side Catalytic Converter Pair for Infiniti G35/FX35/M35/350Z 3.5L V6 (EPA Compliant) |  |
| Best Value for Money The sweet spot between price and what you get | Dylannet Universal 2.5" Weld-On Catalytic Converter with O2 Port (2.5" Inlet/Outlet) |  |
| Best Overall The best all-around choice for most situations | PHILTOP High-Flow Catalytic Converter for Infiniti FX35 |  |
1. Walker Standard EPA 15036 Universal Catalytic Converter
| Manufacturer | Tenneco (Dynomax, Walker, Thrush) |
|---|---|
| OEM Part Number | 15036 |
| Compatibility note | For pre-OBDII vehicles (1995 and older) |
| Inlet/Outlet | 2" ID inlet and 2" ID outlet |
The Walker Standard EPA 15036 is a universal catalytic converter intended for pre-1996 vehicles and for installers who can adapt a universal unit to their exhaust system. It is built with a stainless steel body, aluminized piping and heat shields where originally equipped to mirror factory heat protection, and includes expandable bushings to help align pipes during installation. In practice this is a replacement part you weld or have welded in place rather than a bolt-on direct-fit, so it is typically used by technicians or experienced DIYers who can cut, fit and weld exhaust tubing. The unit requires no break-in and is marketed to meet EPA emissions requirements for older vehicles. Practical benefits are durability from stainless construction and a design that reduces tailpipe emissions for compliance testing. Limitations are that it is a universal part that may need welding or fabrication to fit the Infiniti FX35 exhaust layout and it is only specified for pre-OBDII applications, so compatibility and legal allowance should be checked before use.
Best for: Reliability-focused buyers who prioritize a durable, emissions-capable replacement and are comfortable arranging professional installation or custom exhaust work to ensure proper fit and compliance.
Less Ideal for: Buyers seeking a direct-fit, bolt-on converter for the Infiniti FX35 or those who cannot or will not have welding or fabrication performed should consider vehicle-specific factory-quality replacements instead.
- EPA-compliant design for pre-OBDII emissions reduction
- Stainless-steel shell with aluminized pipe and heat shields for corrosion and heat protection
- Expandable bushings facilitate alignment during custom fitment
- No break-in required after installation
- Universal design often requires cutting, welding, or professional fabrication to fit specific exhausts
- Intended for pre-1996 vehicles so not suitable for OBDII-era emission systems
Verdict A durable, EPA-focused universal converter that works well if you want a reliable emissions replacement and are prepared to have it welded or modified to fit the FX35.
2. ASOPARTS 3" Universal Catalytic Converter (3" Inlet/Outlet)
| Installation Type | Bolt-On |
|---|---|
| Inlet/Outlet | 3" / 3" |
| Overall Length | 11" |
| Manufacturer | ASOPARTS |
These ASOPARTS catalytic converters are universal 3" bolt-on units designed to replace a failed converter or to fit a custom exhaust run where a 3" inlet and outlet are required. They use an internal honeycomb ceramic substrate and a stainless-style aluminized shell intended to resist heat and corrosion. Installation is straightforward for a shop or an experienced DIYer because they accept standard 3" pipe and include O2 sensor bungs on many listings, so sensors can be reinstalled without modification. In practice the converters work best where fitment is approximate and minor pipe adapters or short sections of exhaust tubing can be used to make the connection. Expect good value for basic emissions function, but note this is a universal unit not a vehicle-specific factory-quality replacement. Some buyers report variability in internal construction and occasional rattling or ineffective catalyst performance, so long-term durability and emissions effectiveness can be inconsistent compared with OEM-style converters. Professional installation and verification of O2 sensor readings are recommended for the Infiniti FX35 to avoid check-engine light issues.
Best for: Convenience-driven buyers who prioritize an affordable, easy-to-install replacement or temporary fix for a 3" exhaust setup on an Infiniti FX35 and prefer quick compatibility with common exhaust tubing.
Less Ideal for: Drivers seeking a guaranteed factory-quality, long-term emissions solution for an FX35 or those who want a direct OEM-equivalent catalytic converter should consider vehicle-specific options instead.
- Universal 3" inlet/outlet fits common 3" exhaust runs for flexible installation on modified systems
- Bolt-on style that accepts standard 3" pipe and allows reuse of O2 sensors when bungs are present
- Aluminized stainless-style body offers basic resistance to rust and heat
- Internal honeycomb substrate provides standard catalytic conversion for emissions control
- Not a vehicle-specific factory-quality replacement so fit and performance can vary
- Reports of intermittent internal loosening or rattling in some units after use
- Some listings lack properly placed O2 bungs or have inconsistent construction quality
Verdict A budget-friendly, easy-to-fit 3" universal cat suitable for quick repairs or modified exhausts on an FX35 but not a substitute for a vehicle-specific factory-quality converter.
3. Anytek Left & Right Catalytic Converter for Nissan/Infiniti 3.5L/3.7L
| Manufacturer Part Number | 10080147-ANK |
|---|---|
| OEM Part Number | 644029, 41096, 17115, 644030, 41097, 17116 |
| Body Material | 409L stainless steel shell |
| Restricted States | CA, CO, NY, ME |
| Warranty | 1-year |
These Anytek catalytic converters are aftermarket replacements intended to restore emissions performance and clear P0420-style codes on compatible 3.5L and 3.7L Infiniti models. They install in place of the factory units and are used when an original converter has failed or to pass an emissions inspection. Notable features include a high-flow catalytic core, 409L stainless steel shell for corrosion resistance, and factory-style connection points intended to match OEM mounting locations. In real use they provide a straightforward emissions fix and several buyers report passing inspections after installation. Be aware the listing notes restricted sale in California, Colorado, New York and Maine due to state emissions rules, and some customers needed minor trimming or welding to achieve perfect fitment. The product carries a one-year warranty and is designed as a budget-conscious alternative to dealer parts while aiming to maintain performance and emission control for compatible Infiniti vehicles.
Best for: Performance-oriented owners who need a direct replacement to restore emissions function and return their Infiniti to factory-like operation while keeping cost down.
Less Ideal for: Drivers in states with stricter emissions laws or those seeking a long-term OEM-level warranty and guaranteed fitment without any modification should consider factory-quality replacements or dealer parts instead.
- Designed to match factory mounting locations for direct replacement on specified 3.5L/3.7L Infiniti models
- 409L stainless steel shell for improved corrosion and heat resistance
- High-flow catalytic core intended to restore emissions control and help clear diagnostic trouble codes
- Multiple buyers report successful emissions tests after installation
- Not legal for sale or use in certain states with stricter emissions regulations
- May require minor trimming, adjustment, or welding for perfect fit on some vehicles
- Warranty limited to one year which is shorter than some OEM alternatives
Verdict A budget-minded, performance-oriented factory-style catalytic converter option for compatible Infiniti 3.5L/3.7L models that can restore emissions performance but is restricted in some states and may need minor fitment adjustments.
4. Yeoflagtrade 2.25" High-Flow Universal Catalytic Converter (2 pcs)
| Inlet/Outlet Diameter | 2.25 Inch |
|---|---|
| Quantity | 2 pcs |
| Core Type | Three-way catalytic converter |
| Material | Stainless steel |
| O2 Sensor Port | Included |
This Yeoflagtrade kit supplies two 2.25-inch universal high-flow catalytic converters intended as a low-cost replacement for a damaged or missing cat on compatible exhaust systems. They are stainless steel units with a three-way catalytic core and an O2 sensor port, sold as direct-fit-style pieces that are ready to weld into place. In practice these are useful for DIY repairs or temporary service on an Infiniti FX35 when a budget option is needed to clear a check engine light or meet basic emissions checks outside states with restrictive rules. Buyers should expect variable longevity compared with factory-quality converters because these use spun ceramic cores and aftermarket construction; some users report good service life while others see premature failure. Fitment requires matching pipe diameter and welding; they are not a vehicle-specific factory replacement, and they cannot ship to certain states with stricter emissions laws. For cost-conscious owners who can weld and accept shorter life versus OEM parts, this is a practical stopgap solution.
Best for: Budget-conscious Infiniti FX35 owners who prioritize a low-cost, do-it-yourself repair and are comfortable welding and swapping exhaust components themselves.
Less Ideal for: Owners who need a guaranteed long-term factory-quality replacement, want a bolt-on direct-fit factory part, or must meet strict state emissions certification should look elsewhere.
- Low upfront cost for replacing a failed catalytic converter
- Includes O2 sensor port for easier installation and ECU compatibility
- Stainless steel construction resists corrosion better than cheap materials
- Sold as a pair so you can address both sides of a dual exhaust or have a spare
- Universal welded fit requires cutting and welding rather than bolt-on direct replacement
- Aftermarket spun ceramic cores can have shorter and less consistent lifespan than factory-quality converters
- Not compliant for sale or use in several states with strict emissions regulations
Verdict A cheap, do-it-yourself repair option for an Infiniti FX35 that restores emissions function quickly but sacrifices consistent long-term durability compared with factory replacements.
5. AutoShack Driver and Passenger Side Catalytic Converter Pair for Infiniti G35/FX35/M35/350Z 3.5L V6 (EPA Compliant)
| Compatible engines | 3.5L V6 |
|---|---|
| Application | Infiniti G35, FX35, M35 and Nissan 350Z (listed years) |
| Exterior | Stainless Steel and Ceramic |
| Package | Pair, driver and passenger |
These two catalytic converters from AutoShack are sold as a matched driver and passenger pair intended to replace the factory units on 3.5L V6 Infiniti G35, FX35, M35 and Nissan 350Z models. They are direct-fit parts that bolt onto the existing exhaust without welding in most cases, and some units ship in two pieces with included hardware for on-car assembly. The converters are described as stainless steel with ceramic internals and are EPA compliant, though the listing notes they are not legal for sale in certain states with stricter emissions rules. For everyday driving this replacement restores emissions control and should return your vehicle to proper exhaust function without the cost or complexity of custom fabrication. Expect straightforward installation by a competent DIYer or a professional shop, but check fitment carefully for your specific model year and be aware of state emissions restrictions that may prevent legal use in some regions.
Best for: Risk-averse mainstream buyers who prioritize restoring factory-level emissions control and prefer a direct-fit replacement that a shop can install with minimal fuss.
Less Ideal for: Drivers in states with stricter emissions laws or owners seeking an emissions solution certified for those states should look for compliant, state-approved converters instead.
- Direct-fit pair that installs onto existing exhaust with included hardware for many applications
- EPA-compliant design for use in most states outside restricted jurisdictions
- Stainless steel exterior with ceramic substrate aimed at restoring emissions control
- Sells as a matched driver and passenger set so you replace both sides together
- Not legal for sale or use in California, Colorado, New York, and Maine due to state emissions regulations
- Some units arrive in two pieces and require on-vehicle assembly which adds installation steps
Verdict A practical, direct-fit catalytic converter pair for 3.5L Infiniti models that restores emissions function for most states but is not legal in several strict-emission states.
6. Dylannet Universal 2.5" Weld-On Catalytic Converter with O2 Port (2.5" Inlet/Outlet)
| Inlet/Outlet | 2.5" / 2.5" |
|---|---|
| O2 Port | Included |
| Material | Stainless steel |
| Total Length | 13 inches |
This Dylannet catalytic converter is a straightforward universal replacement intended for systems with 2.5" inlet and outlet piping. It is a weld-on style with an O2 sensor port and a heat shield, so installers can splice it into the exhaust before or after the factory cat depending on fit and emissions requirements. The unit is stainless steel and claims an internal catalyst coated with precious metals to convert pollutants while supporting reasonable flow. Typical use is as a budget-minded repair or secondary converter where exact vehicle-specific fitment is not available. Practical benefits include easy welding or band-clamp installation, a built-in O2 bung for sensor relocation, and corrosion-resistant construction for longer service life. Limitations are that it is a universal part not tailored to the Infiniti FX35’s factory geometry or emissions calibrations, and some buyers report the internal substrate and flow characteristics vary so it may not clear a persistent check-engine light on primary converter circuits. Expect occasional pipe modifications or professional fitment to achieve a correct seal and emissions compliance on the FX35.
Best for: Practical optimizers looking for an affordable, serviceable replacement to keep an Infiniti FX35 running without buying an expensive OEM converter, preferring parts they can adapt or have a shop install efficiently.
Less Ideal for: Buyers seeking a direct factory-quality replacement to guarantee emissions compliance or to permanently clear primary converter fault codes on the FX35 should consider a vehicle-specific factory-quality unit instead.
- Weld-on universal design fits common 2.5" exhaust pipes for straightforward replacement
- Built-in O2 sensor port allows relocation of the oxygen sensor without drilling
- Stainless steel exterior and machined finish improve corrosion resistance and appearance
- Includes heat shield to reduce radiant heat transfer to nearby components
- Universal sizing can require pipe expansion, trimming, or welding to fit the FX35’s factory exhaust layout
- Not vehicle-specific so it may not resolve check-engine lights tied to primary converter performance or strict emissions calibrations
- Not approved for sale in several states with stricter emission rules, so it may not meet local regulatory requirements
Verdict A cost-conscious universal 2.5" catalytic converter that works as a practical repair option for an Infiniti FX35 but may require professional fitment and will not guarantee factory-level emissions compliance.
7. PHILTOP High-Flow Catalytic Converter for Infiniti FX35
| Fitment | Infiniti FX35 3.5/3.7L compatible |
|---|---|
| Construction | Stainless steel with welded seams |
| Internal substrate | Honeycomb ceramic with precious metal catalyst |
| EPA status | EPA compliant (restricted in some states) |
This PHILTOP catalytic converter is a direct-replacement style unit intended to restore exhaust purification and engine performance on compatible Infiniti 3.5/3.7L vehicles such as the FX35. It uses an internal honeycomb ceramic substrate with high-load precious metal catalyst to reduce emissions while the high-flow design aims to minimize backpressure so throttle response and power are preserved. The converter is stainless steel with welded seams for corrosion and heat resistance, and PHILTOP states it is EPA compliant for many states. Installation is typical for exhaust work and may require a professional if flange alignment or oxygen-sensor locations need adjustment; some buyers report straightforward fit while others found fitment or mounting-tab differences that required modification. For FX35 owners this unit can clear codes and pass emissions when fitted correctly, but verify local regulations since EPA-compliant aftermarket converters have state restrictions. Expect a durable, performance-conscious replacement that may need shop installation for a precise fit.
Best for: Balanced Infiniti FX35 owners who want a durable, emissions-capable replacement that maintains engine performance and are willing to use a shop for precise installation if needed.
Less Ideal for: Drivers who need a fully plug-and-play factory-identical converter or who live in states that prohibit aftermarket EPA-style converters should consider dealer or state-specific options instead.
- High-flow ceramic substrate to reduce backpressure and help preserve engine power
- Stainless steel construction with welded seams for improved corrosion and heat resistance
- Designed to replace factory catalytic part numbers used on Infiniti 3.5/3.7L applications
- EPA compliant for sale in many states outside restricted jurisdictions
- Can restore emissions performance and turn off related fault codes when fitted correctly
- May require professional installation or modification for exact flange alignment and mounting
- Not legal for sale or installation in certain states with stricter aftermarket converter rules
- Fitment reports vary between easy installs and units that need adjustment to match factory heat shield or mounts
Verdict A performance-minded, corrosion-resistant replacement catalytic converter for the FX35 that can restore emissions function and preserve power but may need professional fitting in some cases.
Choosing the Right Infiniti FX35 Catalytic Converter: Key Factors to Consider
Exact Fit and Mounting
Accurate physical fit matters because misaligned flanges or incorrect pipe diameters can cause exhaust leaks and complicate installation. Confirming bolt pattern, hanger locations, and inlet/outlet orientation reduces the need for welding or adapter pieces.
A converter that matches factory mounting points shortens labor time and lowers the chance of vibration-related fatigue. Fit also affects sensor placement; incorrect positioning can trigger diagnostic trouble codes or affect closed-loop fuel control.
Substrate Type and Cell Density
The internal substrate and cells per square inch determine how effectively the converter oxidizes hydrocarbons and reduces NOx. Higher cell density typically increases contact surface area for catalytic reactions but can raise backpressure if not well designed.
Choosing the right balance between conversion surface area and flow is important. For the Infiniti FX35 application, a substrate that sustains chemical activity while tolerating thermal cycling will support consistent emissions control without harming performance.
Oxygen Sensor Compatibility
Catalytic converters interact with upstream and downstream oxygen sensors to manage fuel trim and emission monitoring. Proper sensor bungs and their spacing ensure accurate feedback to the engine control unit and help avoid false check-engine alerts related to the catalytic system.
If sensor ports are absent or poorly located, you may need modifications that can introduce leaks or complicate diagnostics. Maintaining factory sensor geometry preserves emission test readiness and ECU behavior.
Thermal Durability and Coating
Converters experience extreme temperatures during normal operation. A high-quality heat-resistant washcoat and robust substrate reduce the risk of catalyst washout or premature failure under repeated thermal cycling.
Durability affects long-term emission performance and resistance to contaminants. Products designed with appropriate coatings and thermal management are less likely to degrade after exposure to road salt, fuel additives, or overheating events.
Backpressure and Flow Characteristics
Excessive backpressure can lower engine power and fuel efficiency, while too little backpressure may reduce conversion efficiency if flow dynamics are compromised. A converter tuned for balanced flow preserves throttle response and avoids undue strain on the exhaust and turbocharging systems if present.
Consider how the converter integrates with the rest of the exhaust system. Units designed to maintain near-stock pressure profiles are usually the best choice for retaining expected drivability.
Emissions Certification and Durability Testing
Validated emissions performance, or evidence of durability testing, gives confidence that the converter will meet regulatory requirements over time. Look for information on laboratory cycling, thermal shock resistance, and longevity under simulated road conditions.
Certifications or documented test results are indicators that the unit can sustain conversion efficiency and resist failure modes that lead to increased exhaust emissions or sensor faults.
FAQ
What are common catalytic converter symptoms on an Infiniti FX35?
Common symptoms often include reduced engine power, poor acceleration, and a noticeable drop in fuel economy. You may also experience a rotten-egg smell from the exhaust or visible black smoke when the converter is severely restricted or failing.
Will a check engine light indicate a catalytic converter problem?
Often a check engine light can point to catalytic converter issues, particularly if diagnostic codes relate to oxygen sensor readings or catalyst efficiency. However, the light can indicate other problems as well, so a proper scan and live data review are usually needed to confirm converter-related faults.
Can I replace the catalytic converter myself on an Infiniti FX35?
Many owners with mechanical experience can perform the replacement, but it depends on access, tools, and welding needs. Some converters require exact alignment or sensor port work, so assess whether you have the equipment and skills before attempting a DIY replacement.
How does a failing catalytic converter affect emissions?
A failing converter reduces its ability to convert hydrocarbons, carbon monoxide, and NOx into less harmful gases. As a result, exhaust emissions typically rise and the vehicle may fail emissions inspections or produce visible smoke or strong odors.
What should I check before buying a replacement converter for my Infiniti FX35?
Verify that the unit matches the FX35s inlet/outlet sizes, sensor locations, and mounting points. Also check substrate type, documented durability, and whether the product provides adequate conversion efficiency for your vehicle's emission control needs.
How We Chose the Best Infiniti FX35 Catalytic Converter
We prioritized items that match the Infiniti FX35s factory fitment standards and emission control requirements. Key evaluation areas included physical fit and mounting points, substrate material and cell density relevant to conversion efficiency, and compatibility with oxygen sensor locations to avoid trigger errors. We also considered thermal durability under repeated heating cycles, and overall flow characteristics tied to backpressure and engine performance.We excluded products that lacked clear fitment documentation or did not meet emissions durability expectations. Trim levels, aftermarket styling, or unverified universal-fit claims were not considered. The resulting list reflects options that align with real-world installation constraints, emission reduction performance, and expected longevity for the Infiniti FX35.
Our full evaluation process is outlined in our review methodology.
Conclusion
When replacing a catalytic converter on an Infiniti FX35, prioritize correct physical fit, proper sensor compatibility, and a substrate designed for durable conversion performance. Balancing flow characteristics with conversion efficiency helps preserve drivability while reducing emissions.Expect tradeoffs between higher cell densities and potential backpressure. Focus on verified fitment details and evidence of thermal durability to choose a unit that will maintain emission control and reliable operation over time.
Explore More:
- Check out all Infiniti FX35 parts & accessories
- Explore Catalytic Converters Maintenance & Repair Guides
- Explore Exhaust & Emissions
- Browse all Auto Parts
