Next Level Performance
September 6, 2026 • 9 min read
Choosing a Dodge Charger or Challenger catalytic converter comes down to two questions: what engine sits between your fenders, and which state you register the car in. From the 3.5L and 3.6L Pentastar V6s to the 5.7L, 6.4L 392, and 707-hp supercharged 6.2L HEMI, every LX/LC-platform Mopar uses engine-specific, direct-fit converters — and the emissions grade you legally need can more than double the price. This guide breaks down the best MagnaFlow direct-fit converters for the 2005–2023 Charger and 2008–2023 Challenger, with real part numbers, CARB versus 49-state legality, and pricing from roughly $660 to just under $2,000.
Our Verdict
For 6.4L 392 and 6.2L Hellcat owners, the MagnaFlow CARB-legal underbody converter (5461478) is the safest all-states pick; drivers outside California save big with the 49-state HEMI unit (52478).
MagnaFlow builds a direct-fit converter for every Charger and Challenger engine. The single biggest cost driver is not power — it is whether you need a California Air Resources Board (CARB) Executive Order converter or a cheaper federal 49-state unit. Match your engine and your state, and installation is a genuine bolt-on.
Shop Our Top Pick →Why Does a Charger or Challenger Need a New Catalytic Converter?
A catalytic converter is a stainless-steel canister with a precious-metal-coated ceramic honeycomb that converts hydrocarbons, carbon monoxide, and NOx into water, CO2, and nitrogen. On the Dodge LX/LC platform (Charger, Challenger, and the related Chrysler 300 and Dodge Magnum), the factory converters are packaged tight to the exhaust manifolds and typically last 100,000 to 150,000 miles. They fail early when oil or coolant contaminates the substrate, when a misfire dumps raw fuel into the cat, or when the honeycomb overheats and melts.
The most common trigger for a replacement is a P0420 (Bank 1) or P0430 (Bank 2) diagnostic trouble code — "Catalyst System Efficiency Below Threshold." That code means the downstream oxygen sensor is reading almost the same as the upstream sensor, so the converter is no longer scrubbing exhaust effectively. Other symptoms include a rotten-egg sulfur smell, a rattling substrate, failed emissions testing, and sluggish throttle response from a clogged, restricted cat. A quality direct-fit converter restores exhaust flow, clears the check-engine light, and gets the car back to legal, OE-level emissions.
MagnaFlow direct-fit converters use OE-style flanges for a true bolt-on replacement.
CARB vs. 49-State: Which MagnaFlow Converter Is Legal for You?
This is the decision that determines both legality and price. MagnaFlow builds its Charger and Challenger converters in two emissions grades, and they are not interchangeable in the eyes of the law:
- California Grade (CARB compliant): Carries a California Air Resources Board Executive Order (EO) number and is legal in all 50 states, including California and the CARB-following states (New York, Colorado, Maine, and others). On a California-registered vehicle these converters carry a 5-year / 50,000-mile warranty against defects and emissions failure.
- OEM Grade (Federal / 49-state): Meets U.S. EPA standards and is legal in the 49 states outside California. It cannot be sold, shipped, or installed on a vehicle registered in California. These units are backed by a 5-year defect warranty and a 25,000-mile emissions warranty, and they typically cost far less than the CARB version of the same fitment.
The price gap is dramatic. A 49-state converter for the 6.4L HEMI runs around $700, while the CARB-legal underbody unit that covers the same Scat Pack, SRT 392, and Hellcat cars lists just over $1,800. If you live outside California, buying the federal grade is the smart move — you get the same MagnaFlow stainless construction and mandrel-bent tubing for hundreds less. If you register in California or a CARB state, only the EO-numbered converter will pass a smog inspection, full stop. At our Tampa, FL shop we always confirm the customer's registration state before ordering, because a returned converter that has been bolted up is no longer returnable.
Federal 49-state converters like this 3.6L Pentastar unit cost far less than the CARB version of the same fitment.
Best Dodge Charger & Challenger Catalytic Converters
Below are our top MagnaFlow direct-fit picks, organized by engine. Match the converter to your exact engine and model year, and note whether you need CARB or 49-state grade. Prices update live from our store.
Key Specifications — Top Pick (5461478)
Dodge Charger & Challenger Converter Comparison
| Kit | Engine | Emissions Grade | Warranty | Price |
|---|---|---|---|---|
| 2015+ HEMI CARB UnderbodyTop Pick | 6.4L / 6.2L HEMI | CARB (50-state) | 5 yr / 50k mi | $1,816.00 |
| 2007-2010 3.5L V6 CARB | 3.5L V6 | CARB (50-state) | 5 yr / 50k mi | $1,984.00 |
| 2011-2014 3.6L Pentastar | 3.6L V6 | Federal 49-state | 5 yr / 25k mi | $838.00 |
| 2015+ 6.4L/6.2L HEMI 49-State | 6.4L / 6.2L HEMI | Federal 49-state | 5 yr / 25k mi | $713.00 |
| 2005-2009 5.7L HEMI 49-State | 5.7L HEMI | Federal 49-state | 5 yr / 25k mi | $660.00 |
MagnaFlow Underbody CARB Converter: Pros & Cons
What We Like
- + CARB Executive Order number means legal in all 50 states
- + Covers Scat Pack, SRT 392, and Hellcat in one part
- + Stainless construction with a 5-year / 50,000-mile warranty
- + True direct-fit — reuses factory hangers and flanges
Things to Consider
- – Costs far more than the 49-state version of the same fitment
- – Emissions-legal replacement, not a power-adding high-flow race cat
The 2015+ HEMI underbody converter is a CARB-legal, direct-fit replacement for Scat Pack, SRT 392, and Hellcat cars.
How to Choose the Right Converter for Your HEMI or V6
Getting the right converter the first time comes down to four checks. First, confirm the exact engine — a 5.7L R/T, a 6.4L 392, and a 6.2L Hellcat all use different converters, and the V6 3.5L and 3.6L Pentastar are different again. Second, verify your model year, because MagnaFlow splits fitments at the 2015 refresh. Third, choose your emissions grade by registration state: CARB for California and CARB states, federal 49-state everywhere else. Fourth, note that the LX/LC platform uses a converter per side on many applications — if one side has failed, inspect the other before you order.
The 49-state 6.4L/6.2L HEMI converter shares fitment with the CARB unit at roughly a third of the cost.
A new converter will not add meaningful horsepower on its own; its job is to restore lost flow and clear codes. Real gains come from pairing a healthy cat with a high-flow cat-back exhaust and a tune. But a failing, clogged converter absolutely robs power and throttle response, so a fresh direct-fit unit often feels like it "woke the car up." Browse the full range in our catalytic converters collection, and if you are unsure of the fitment, our Tampa team will match it to your VIN.
Frequently Asked Questions
Will a new catalytic converter add horsepower to my Charger or Challenger?
A direct-fit replacement converter does not add meaningful horsepower on a healthy car — it restores the OE flow you lost as the old converter clogged. If your factory cat is restricted or failing, a fresh unit can noticeably improve throttle response and reclaim lost power, but a stock-style converter is an emissions and drivability part, not a power adder. For real gains, pair it with a high-flow cat-back exhaust and a tune.
What does a P0420 code mean on a Dodge HEMI?
P0420 (Bank 1) and P0430 (Bank 2) mean "Catalyst System Efficiency Below Threshold" — the downstream oxygen sensor is reading nearly the same as the upstream sensor, so the converter is no longer scrubbing exhaust effectively. On a HEMI it usually points to an aged or contaminated converter, though a lazy O2 sensor or exhaust leak can mimic it. A direct-fit converter is the fix once sensors and leaks are ruled out.
Do I need a CARB-compliant converter for my Dodge Charger or Challenger?
If your car is registered in California or a CARB-following state (such as New York, Colorado, or Maine), yes — you legally need a converter with a CARB Executive Order (EO) number, and it is the only type that will pass a smog check. Federal 49-state converters cannot be sold, shipped, or installed on a California-registered vehicle. In the other 49 states, the cheaper federal-grade converter is fully legal.
How much does a Charger or Challenger catalytic converter cost?
MagnaFlow direct-fit converters for the Charger and Challenger range from about $660 for a 49-state 5.7L HEMI unit to just under $2,000 for a CARB-legal V6 converter. The two biggest cost drivers are the emissions grade (CARB-legal units cost significantly more than federal 49-state ones) and the engine. HEMI 49-state converters typically land around $700.
How long do factory Dodge catalytic converters last?
Factory converters on the LX/LC platform typically last 100,000 to 150,000 miles. They fail early when oil or coolant contaminates the substrate, when misfires dump raw fuel into the cat, or when overheating melts the honeycomb. Chronic rich running, a bad tune, or repeated short trips shorten their life considerably.
Are these MagnaFlow converters a direct bolt-on?
Yes. MagnaFlow direct-fit converters use OE-style flanges, sensor bungs, and hanger locations, so they bolt in without cutting or welding. Note that many Charger and Challenger applications use a converter per side (driver and passenger), so confirm whether you need one or both before ordering.
Keep Your Mopar Legal and Running Right
Shop direct-fit catalytic converters for every Charger and Challenger engine at NLP Performance.
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