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 a Chrysler 300, choosing the right catalytic converter matters for emissions compliance and engine performance. A correctly matched unit helps reduce harmful exhaust gases, supports fuel efficiency, and prevents drivability problems that can arise from a clogged or failing converter. This guide covers the top shortlisted catalytic converters for the Chrysler 300, focusing on options that meet fitment and emission standards. Below you will find our top picks and the evaluation criteria we used to assess each candidate, including fitment, emission control effectiveness, and durability.
Looking for other parts? See all Chrysler 300 parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | Torchtree Catalytic Converter for Chrysler 300 (2005–2010) |  |
| Best Quality Built to a higher standard if you want something more solid | CIRconvert Left & Right Catalytic Converter for 2016–2020 Chrysler 300 3.6L V6 (EPA Compliant) |  |
| Best Budget The cheapest option that still gets the job done reliably | Excel Exhaust EPA-Compliant Catalytic Converter Replacement for Chrysler 300 3.6L (4-Bolt Flange) |  |
| Most Sold A high-volume bestseller chosen again and again | Panidarun Catalytic Converter for Chrysler 300 3.6L (2016–2021) |  |
| Best Value for Money The sweet spot between price and what you get | PTPDRH Catalytic Converter for Chrysler 300 5.7L (Left/Right) – EPA Compliant |  |
| Best Overall The best all-around choice for most situations | CIRconvert Left & Right Catalytic Converter for Chrysler 300 and Dodge Charger 3.6L V6 |  |
1. Torchtree Catalytic Converter for Chrysler 300 (2005–2010)
| Vehicle fitment | Chrysler 300 2005–2010 2.7L, 3.5L |
|---|---|
| O2 ports | 2 |
| Material | Stainless steel body; ceramic substrate |
| Position | Left or Right |
| EPA status | EPA compliant for federal emissions models |
This Torchtree catalytic converter replaces the factory unit on Chrysler 300 2005–2010 2.7L and 3.5L applications as a bolt-on, flange-to-flange part. It uses a ceramic honeycomb substrate in a stainless steel body and ships with gaskets and hardware for direct replacement of the left or right converter. The high-flow design is intended to restore three-way catalyst efficiency while minimizing backpressure so the engine can retain usable power and clear P0420/P0430 codes. Typical use is a direct exhaust repair for failed or clogged converters on the specified 300 models; installation is straightforward where flange alignment is correct, though some buyers report needing alternate gaskets or clamps. The unit is EPA compliant for federal emissions vehicles but is not for certain restricted states. Practical benefits are lower cost than dealer units and heavy welded construction for heat resistance, while potential downsides include occasional fitment or hardware size mismatches and variability in included gasket quality compared with factory parts.
Best for: Reliability-focused buyers who prioritize restoring emissions function and clearing catalyst-related codes on a Chrysler 300 2005–2010 while avoiding dealer pricing.
Less Ideal for: Buyers in states with stricter emissions regulations or owners who require guaranteed factory-identical hardware and gaskets without any fitment modification.
- Flange-to-flange bolt-on design for direct replacement on specified Chrysler 300 models
- Stainless steel body with welded connections for durability under exhaust heat
- Includes gaskets and hardware for a mostly complete installation
- High-flow ceramic substrate intended to maintain engine output and reduce emissions codes
- Not legal for sale or use in certain restricted states due to emissions rules
- Some buyers report mismatched hardware sizes or minor fitment adjustments required
- Included gaskets may be lower quality than factory multilayer steel gaskets
Verdict A cost-effective stainless steel, high-flow replacement for Chrysler 300 (2005–2010) that restores emissions performance for federal vehicles but may need minor fitment or gasket upgrades.
2. CIRconvert Left & Right Catalytic Converter for 2016–2020 Chrysler 300 3.6L V6 (EPA Compliant)
| Vehicle fitment | 2016–2020 Chrysler 300 3.6L V6 |
|---|---|
| Position | Left, Right |
| Certification | EPA compliant |
| Manufacturer | CIRconvert |
These CIRconvert catalytic converters are sold as a left and right direct-fit replacement for the Chrysler 300 3.6L V6 (2016–2020). They are manufactured from stainless steel with laser-cut and welded joints and ship with mounting hardware for a straightforward bolt-on installation by a shop or experienced DIYer. The unit is EPA certified, so it restores emissions control and is intended to return catalytic function and clear related check-engine codes. For performance-focused owners the build quality and included hardware mean less worry about fitment gaps or broken manifold studs during installation, and several buyers report restored smoothness and normal fuel economy after replacement. Limitations: these are designed for use outside certain states and are not CARB-compliant, so they cannot be used in California, Colorado, New York, or Maine, and you may need to replace small included components like the exhaust clamp for long-term durability. Expect professional installation for best results and to verify sensor alignment.
Best for: Performance-oriented Chrysler 300 owners who want a robust, factory-quality replacement to restore emissions function and maintain engine performance without modifying the exhaust system.
Less Ideal for: Owners in states requiring CARB-compliant parts or buyers seeking an aftermarket performance-oriented high-flow converter should consider alternatives designed for those requirements.
- Direct-fit design for 2016–2020 Chrysler 300 3.6L V6 simplifies installation
- Constructed from high-strength stainless steel with laser welding for corrosion and heat resistance
- EPA certified to meet federal emissions requirements and reduce emissions
- Includes mounting hardware, gaskets, and replacement bolts to aid a complete install
- Not CARB-compliant and cannot be used or shipped to certain states
- Only one exhaust clamp included and clamp quality may be inferior
- Requires professional installation to ensure sensor alignment and optimal performance
Verdict Solid stainless-steel, EPA-compliant direct-fit converters for the Chrysler 300 that restore emissions control and drivability but are not CARB-approved.
3. Excel Exhaust EPA-Compliant Catalytic Converter Replacement for Chrysler 300 3.6L (4-Bolt Flange)
| Vehicle fit | Chrysler 300 2011-2022, 3.6L |
|---|---|
| Flange type | 4 BOLTS FLANGE |
| EPA compliance | Yes |
| Manufacturer | Excel Exhaust |
This Excel Exhaust catalytic converter is a budget-focused replacement designed to fit Chrysler 300 vehicles with the 3.6L engine and a 4-bolt flange. It installs in place of the factory unit and is intended to restore emissions control and engine performance when a worn or damaged converter is removed. The listing emphasizes EPA compliance and a direct-fit approach to simplify installation, though one user reported needing cutting, welding or clamps on the right side for certain AWD configurations. Practical benefits include restored emissions function, improved exhaust flow compared with some aged stock converters, and compatibility with standard O2 sensor locations. Limitations to be aware of are potential fitment adjustments on AWD variants, the need for O2 sensor plugs or sensors for three-hole locations per side, and the possibility of professional installation if cutting or welding is required. For a budget replacement this unit delivers core functionality but may require extra work to achieve a perfect fit in some chassis variants.
Best for: Budget-conscious owners seeking an affordable, emission-compliant replacement for a Chrysler 300 3.6L who prioritize restoring emissions function and basic drivability without paying for premium aftermarket parts.
Less Ideal for: Owners who want a guaranteed bolt-in, no-modification solution for every chassis variant or those seeking a long-term performance upgrade without potential size or durability compromises should consider higher-end options or professional-fit parts.
- EPA-compliant design suitable for emissions replacement programs
- Direct-fit intent for Chrysler 300 3.6L with 4-bolt flange to simplify installation
- Improved exhaust flow compared with many aged factory converters
- Compatible with existing O2 sensor locations for easy sensor re-use
- May require cutting, welding, or clamps for proper fit on some AWD configurations
- Smaller internal size than OEM in some cases which could affect long-term durability
- Three-hole per side O2 locations may require additional plugs or sensors
Verdict A cost-focused, EPA-compliant replacement that restores emissions control for Chrysler 300 3.6L but may need minor cutting or welding on some AWD setups.
4. Panidarun Catalytic Converter for Chrysler 300 3.6L (2016–2021)
| Brand | Panidarun |
|---|---|
| Model | Catalytic Converter |
| Exterior | Polished |
This Panidarun catalytic converter is a direct-fit replacement designed specifically for the Chrysler 300 with the 3.6L engine (2016–2021). It installs in place of the factory unit and contains a ceramic substrate inside a heat-resistant stainless steel housing to convert harmful exhaust gases while maintaining proper flow and engine efficiency. The listing notes a complete assembly with gaskets and hardware, which simplifies installation and reduces the chance of missing parts during a repair. Practical benefits include restoring emissions compliance and avoiding custom fabrication or modification. Limitations are typical of aftermarket converters: buyers should verify exact fitment before purchase and expect that installation may require professional mounting or oxygen sensor transfer depending on vehicle condition. The polished exterior looks durable but does not guarantee OEM-level emissions certification in every region, so confirm local regulations if that is a concern.
Best for: Risk-averse mainstream buyers who want a ready-made, vehicle-specific replacement that minimizes modification and gets the car back to emissions-compliant running with minimal fuss.
Less Ideal for: Drivers who need a fully certified emissions part for regions with strict certification rules or those seeking a performance-oriented or custom exhaust solution.
- Direct-fit design built for Chrysler 300 3.6L (2016–2021) to simplify replacement
- Stainless steel housing and ceramic substrate intended to withstand high exhaust temperatures
- Includes gaskets and hardware for a more straightforward installation
- Aims to restore exhaust flow and maintain engine efficiency after replacement
- Not explicitly certified to meet every regional emissions certification standard
- May require professional installation or sensor transfer for correct fitment
Verdict A vehicle-specific, ready-to-install catalytic converter that restores emissions control and exhaust flow for Chrysler 300 3.6L owners who want a straightforward replacement solution.
5. PTPDRH Catalytic Converter for Chrysler 300 5.7L (Left/Right) – EPA Compliant
| Compatible engine | 5.7L V8 |
|---|---|
| Fitment | Chrysler 300 5.7L (2005-2022) compatible |
| Exterior | Stainless Steel |
| EPA certification | U.S. federal emissions compliant |
This PTPDRH catalytic converter is marketed as a direct-fit, EPA-compliant replacement for the Chrysler 300 5.7L and is built for straightforward installation without calibration or programming. It is constructed with stainless-steel housing and a ceramic catalytic core intended to perform a three-way catalytic reaction for exhaust cleaning. Typical use is as a factory-style replacement after failure or for restoring emission control equipment; the unit is shaped and flanged to match factory connections for a bolt-in swap. Practical benefits include EPA certification for federal emissions, corrosion-resistant stainless-steel exterior, and a claimed resistance to thermal shock that supports longevity. The pack includes left and right units and buyers report good fitment when replacing failed converters. Limitations to be aware of are state-specific compliance exclusions and the fact that aftermarket geometry or slightly different internal sizing can change backpressure characteristics compared with factory parts, which may affect high-RPM performance or long-highway runs on heavily loaded vehicles.
Best for: Buyers prioritizing practical, cost-effective repairs who want a straightforward, factory-compatible replacement to restore emissions equipment without aftermarket tuning.
Less Ideal for: Owners seeking a performance-tuned converter for sustained high-RPM highway use or those who must meet stricter state emissions approvals should consider other options.
- EPA-certified for federal emissions compliance
- Stainless-steel exterior resists corrosion
- Drop-in design intended for direct bolt-on replacement
- Claims of ceramic core and thermal-shock resistance for durability
- Not approved for use in several states with stricter rules
- Aftermarket internal sizing may alter backpressure compared with factory units
Verdict A budget-friendly, EPA-certified drop-in replacement for Chrysler 300 5.7L owners who want a practical, corrosion-resistant converter to restore emissions function.
6. CIRconvert Left & Right Catalytic Converter for Chrysler 300 and Dodge Charger 3.6L V6
| Vehicle fitment | 2013–2015 Chrysler 300 3.6L V6; 2013–2017 Dodge Charger 3.6L V6 |
|---|---|
| Material | Stainless steel |
| Certification | EPA compliant |
| Position | Left, Right |
This CIRconvert kit replaces both left and right catalytic converters on 3.6L V6 Chrysler 300 (2013–2015) and Dodge Charger (2013–2017). It is manufactured from stainless steel with laser-cut and welded seams for corrosion and heat resistance, and it ships as a direct-fit replacement intended to bolt into the factory exhaust routing. Typical installation replaces damaged or failed converters to restore emissions control, stop check-engine codes, and recover drivability and fuel economy. Notable points are EPA certification for use outside of certain states, included mounting hardware in many packages, and a 50,000-mile limited warranty. Customers report solid fitment and factory-like durability in most cases, though a minority saw mounting-tab alignment issues or minimal accessory quality differences like thin clamps. Expect a practical, lower-cost alternative to dealer units that performs like a factory replacement when fitment is correct, but verify vehicle-specific fit and local emissions rules before purchase.
Best for: Balanced buyers seeking a factory-replacement style catalytic converter that restores emissions function and drivability without the dealer price, prioritizing reliability and value.
Less Ideal for: Drivers subject to California or similarly strict state emissions laws or those who need guaranteed perfect OEM mounting geometry without any pre-checks should consider dealer or specialized local options instead.
- Direct-fit design for Chrysler 300 3.6L V6 and compatible Dodge Charger applications
- Constructed from stainless steel with laser welding for improved heat and corrosion resistance
- EPA compliant, restoring emissions control and helping clear related check-engine codes
- Includes mounting hardware and replacement bolts in many kits to simplify installation
- 50,000-mile limited warranty provides added ownership reassurance
- Not legal for sale or use in California, Colorado, New York, or Maine
- Some users reported occasional fitment issues with mounting tabs or lower-quality included clamps
Verdict A practical, EPA-certified direct-fit replacement that restores emissions control and drivability for Chrysler 300/Dodge Charger 3.6L V6 owners who want factory-like performance at a lower cost.
Choosing the Right Chrysler 300 Catalytic Converter: Key Factors to Consider
Fitment and Compatibility
Correct physical fit is the baseline for any catalytic converter. Confirming flange type, pipe diameter, and overall length ensures the unit installs without cutting or reshaping factory exhaust components. Proper fit reduces exhaust leaks and avoids stress on hangers and joints, which can otherwise cause premature gasket failure or exhaust noise.
Compatibility also includes oxygen sensor placement and mounting boss locations. A converter that aligns with original sensor ports preserves engine management function and avoids check engine light triggers that arise from incorrect sensor readings.
Emission Conversion Efficiency
The core purpose of the catalytic converter is to convert hydrocarbons, carbon monoxide, and nitrogen oxides into less harmful substances. Substrate type, precious metal loading, and cell density all influence how effectively the unit reduces emissions under real driving conditions. Higher conversion efficiency helps the vehicle meet regulatory thresholds and can prevent failed emissions inspections.
Look for specifications or test data showing conversion rates across operating temperatures. Efficiency at typical engine temperatures matters more than peak lab figures, because converters spend much of their life in steady-state driving and city conditions.
Durability and Material Quality
Catalytic converters are exposed to high heat and corrosive gases, so material quality affects longevity. Stainless steel housings and high-quality internal substrates resist rust and thermal degradation better than lower-grade materials. Durable construction helps prevent cracks, core breakdown, and exhaust leaks that lead to noise and reduced performance.
Heat shielding and robust welds also reduce the chance of external damage from road debris and thermal cycling. Choosing a converter built for durability lowers the chance of repeat replacements and associated labor.
Heat Management and Backpressure
Proper heat management keeps the catalyst at temperatures where conversion is effective without causing excessive backpressure. Excessive backpressure can reduce engine power and increase fuel consumption, while insufficient operating temperature lowers conversion efficiency. Design elements such as optimized substrate flow characteristics and insulation affect how heat is retained and dispersed.
Consider how the converter design interacts with the vehicle's exhaust flow and whether it is likely to introduce restrictive backpressure under heavy loads. A balanced design maintains emissions control while preserving engine responsiveness.
Sensor Integration and Engine Management
Modern vehicles rely on upstream and downstream oxygen sensors to monitor catalyst performance and adjust fuel delivery. A converter must allow correct sensor mounting and not interfere with sensor readings. Poor sensor integration can trigger diagnostic trouble codes and illuminate the check engine light for catalyst efficiency or oxygen sensor faults.
Verify that sensor bungs and wiring routes are compatible with the Chrysler 300's existing sensor locations. Maintaining accurate sensor feedback supports stable engine management and helps avoid limp-home modes or degraded performance.
Installation and Serviceability
Installation complexity affects both initial fit and long-term service costs. Units designed to match factory mounting points reduce installation time and the need for specialized tools or cutting. Consider whether replacement will require additional gaskets, hangers, or exhaust modifications.
Serviceability also covers access for future repairs or sensor replacement. A converter that is straightforward to remove and reinstall makes routine maintenance and troubleshooting easier and less costly over the vehicle's life.
FAQ
What are common catalytic converter symptoms on a Chrysler 300?
Common symptoms often include reduced engine power, a drop in fuel economy, and unusual exhaust odors. You may also notice rattling noises from the exhaust area if the internal substrate is damaged. These signs usually indicate restricted flow or internal breakdown rather than minor sensor issues.
Will a failing catalytic converter trigger the check engine light?
Yes. The check engine light often comes on when oxygen sensor readings indicate poor catalyst efficiency. The engine control unit may log codes related to catalyst performance or oxygen sensor voltages. Those codes help diagnose whether the issue stems from the converter, sensors, or another part of the exhaust system.
How important is matching CAT converter fitment to my Chrysler 300?
Matching fitment is essential to avoid exhaust leaks, maintain proper sensor placement, and prevent extra labor during installation. A unit that does not align with factory flanges or sensor ports can cause drivability issues and may require additional modifications that compromise reliability.
Can a clogged catalytic converter affect emissions testing?
A clogged or degraded converter can reduce conversion efficiency and lead to higher tailpipe readings for hydrocarbons, carbon monoxide, or nitrogen oxides. That degradation increases the likelihood of failing an emissions inspection. Ensuring the converter functions properly helps maintain compliance with emissions requirements.
Is catalytic converter replacement difficult on a Chrysler 300?
Difficulty varies based on the converter design and rust or access at the mounting points. Units that match factory dimensions and use standard flanges are usually straightforward to swap. In some cases, seized bolts or corrosion may complicate the job and require cutting or professional assistance.
What usually causes catalytic converter failure signs?
Failures often stem from prolonged exposure to excessive heat, oil or coolant contamination, or physical damage from road debris. Engine misfires or coolant leaks that allow unburned fuel or fluids into the exhaust can accelerate substrate breakdown. Regular engine maintenance reduces the risk of premature converter failure.
How We Chose the Best Chrysler 300 Catalytic Converter
We prioritized converters that provide exact fitment for the Chrysler 300 and meet or exceed emissions control expectations. Key evaluation criteria included physical fit and flange compatibility with factory exhaust, catalytic substrate type and cell density for conversion efficiency, and verified compliance with emissions standards where applicable. We also considered material construction and corrosion resistance to estimate service life, plus heat management features that reduce the risk of premature failure. We excluded units that require extensive exhaust modification or do not match factory mounting points. Converters with unclear substrate specifications or lacking documented emissions performance were not shortlisted. Our focus was on products that balance reliable fitment, measurable emissions reduction, and build quality appropriate for long-term use in the Chrysler 300.
Our full evaluation process is outlined in our review methodology.
Conclusion
When choosing a catalytic converter for a Chrysler 300, prioritize correct fitment and proven emission conversion efficiency. Those factors have the biggest impact on compliance, drivability, and long-term reliability. Balance durability, sensor integration, and heat management against installation complexity. Addressing the most likely failure causes through proper selection and routine engine maintenance helps extend converter life and avoid repeat service.
Explore More:
- Check out all Chrysler 300 parts & accessories
- Explore Catalytic Converters Maintenance & Repair Guides
- Explore Exhaust & Emissions
- Browse all Auto Parts
