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Mitsubishi Outlander Catalytic Converter w/ Exhaust Manifolds

Mitsubishi Outlander Catalytic converter w/ exhaust manifolds

Starting at $436.95, AutoBuffy stocks 20 catalytic converter with exhaust manifold assemblies from Eastern Catalytic, MagnaFlow, and Walker. This combined unit bolts directly to the engine's exhaust ports, converts harmful combustion gases into less toxic emissions, and routes exhaust downstream. When it fails, you face failed emissions tests, power loss, and potential engine damage from back-pressure or heat.

Signs your Mitsubishi Outlander needs a new catalytic converter with exhaust manifold

  • Check Engine light on with codes P0420 or P0430 indicating catalyst efficiency below threshold
  • Rattling noise from the engine bay at startup or under acceleration — broken internal substrate or cracked manifold
  • Strong sulfur or rotten-egg smell from the exhaust, signaling a converter that can no longer process hydrogen sulfide
  • Noticeable loss of power or sluggish acceleration, especially under load, caused by exhaust back-pressure from a clogged converter
  • Exhaust leak hiss or ticking near the engine, pointing to a cracked manifold flange or failed gasket in the assembly
  • Failed state emissions or OBD-II inspection due to inefficient catalyst readings or an exhaust leak upstream of the O2 sensor

Which catalytic converter with exhaust manifold should you buy for your Mitsubishi Outlander?

Because this assembly combines two critical components, the biggest decisions are OBD-II compliance (CARB vs. EPA), construction quality (direct-fit vs. universal), and substrate type. A direct-fit unit is almost always the right call — it retains all factory O2 sensor bungs, brackets, and flange positions so no fabrication is needed. Make sure any unit you buy is certified for your state's emissions standard before ordering.

Direct-Fit OEM Replacement (EPA-compliant)
Best for
Most drivers in non-CARB states who want a bolt-on repair with no cutting or welding
What you get
Exact flange match, pre-installed O2 sensor ports, stainless steel construction, meets federal EPA standards
Direct-Fit CARB-Compliant Unit
Best for
Drivers in California and other CARB-adopted states where stricter emissions laws apply
What you get
All direct-fit benefits plus an executive order (EO) number for legal sale and use in CARB states — required to pass state smog inspection
OEM / Dealer-Sourced Assembly
Best for
Owners of newer or warranty-sensitive vehicles who need guaranteed fitment and OE-grade metallurgy
What you get
Highest material quality, exact factory spec, longest expected lifespan, but typically the highest upfront cost
Performance High-Flow Assembly
Best for
Enthusiasts seeking improved exhaust scavenging and modest power gains while remaining street-legal
What you get
Less restrictive substrate, mandrel-bent tubing, still meets EPA standards — note: not legal for sale in CARB states unless EO-certified

Catalytic converter w/ exhaust manifolds brands we stock for your Mitsubishi Outlander

Eastern Catalytic
6 options · from $436.95
MagnaFlow
5 options · from $617.95
Walker
3 options · from $595.95
Dorman
3 options · from $575.95
ATP
3 options · from $760.95

Replacing a catalytic converter with exhaust manifold on a Mitsubishi Outlander

Advanced⏱ 2–4 hoursPenetrating oil (applied 24 hours before work)Breaker bar and oxygen sensor socketRatchet with metric and SAE socket setVehicle jack stands or a liftStud extractor set (for seized exhaust studs)

This job is rated Advanced primarily because exhaust manifold studs on higher-mileage engines are frequently seized, requiring penetrating oil, heat, or stud extractors to remove without snapping them into the head. Once hardware is free, the assembly unbolts from the cylinder head and the downpipe, and the new unit installs with fresh gaskets and new fasteners. Reinstall O2 sensors, clear any stored codes, and run the engine to confirm no leaks before returning the vehicle to service.

Frequently asked questions

How much does it cost to replace catalytic converters with exhaust manifold on a Mitsubishi Outlander?
Parts start at $436.95 for a direct-fit assembly on a Mitsubishi Outlander. Add $150–$400 for professional labor depending on your region and how seized the hardware is. Corroded studs or broken exhaust bolts — common on high-mileage engines — are the most frequent cause of labor overruns on this job.
Can I drive my Mitsubishi Outlander with a failing catalytic converter and exhaust manifold assembly?
Short distances are possible, but it is not advisable. A cracked manifold leaks hot exhaust gases near plastic engine components and wiring, creating a fire hazard. A clogged converter builds back-pressure that can damage piston rings and O2 sensors over time. Address the failure promptly to avoid compounding repair costs.
What causes the catalytic converter and exhaust manifold to fail together on a Mitsubishi Outlander?
The most common causes are oil or coolant contamination from a head gasket failure coating and destroying the catalyst substrate, overheating from misfires that dump raw fuel into the converter, and simple heat-cycle fatigue that cracks the cast manifold over years of use. Rust and corrosion on the flanges accelerate failure in road-salt regions.
Will replacing the catalytic converter with exhaust manifold clear the P0420 code on my Mitsubishi Outlander?
Replacing the assembly will resolve P0420 or P0430 if the converter itself is the cause, but not always immediately. After installation, the ECU requires one or more complete drive cycles to run the catalyst monitor. If the code returns, suspect a faulty downstream O2 sensor or an unresolved engine issue feeding the converter bad exhaust.
Do I need a CARB-compliant catalytic converter for my Mitsubishi Outlander?
If you register your vehicle in California or one of the states that has adopted CARB emissions standards, yes — a CARB-compliant unit with a valid EO number is legally required. Installing an EPA-only converter in a CARB state will cause an automatic smog failure. Check your state's DMV or BAR website to confirm which standard applies to you.
Should I replace O2 sensors when I install a new catalytic converter and manifold on my Mitsubishi Outlander?
It is strongly recommended. The upstream (pre-cat) and downstream (post-cat) O2 sensors are exposed to the same heat and contamination that damaged the original assembly. Worn sensors feed the ECU inaccurate data and can trigger the same P0420 code on a brand-new converter, making it appear the new part is defective when it is not.

Shop catalytic converter w/ exhaust manifolds by year for the Mitsubishi Outlander

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More parts for your Mitsubishi Outlander

Engine Mount KitEngine Oil Pressure SwitchBrake Hardware KitCatalytic ConverterStrut BearingExhaust Gas Recirculation (EGR) Gasket SetPCV ValveIgnition Knock (Detonation) Sensor Connector

Catalytic converter w/ exhaust manifolds for other Mitsubishi models

Mitsubishi GalantMitsubishi LancerMitsubishi Outlander SportMitsubishi EndeavorMitsubishi Eclipse