Walker 50578 Catalytic Converter

Brand Walker 50578
Mounting Hardware Included No
Universal Or Specific Fit Specific
Grade Type Regular
Body Shape Round
Inlet Inside Diameter 2.75
Body Height 4
Body Length 8
Body Width 4
Body Material Stainless steel
California Air Resources Board (CARB) Certified No
Overall Length 55
Air Tube No
Air Tube Count No
Converter Quantity 2
Inlet 1 Inside Diameter 2.75
Inlet 1 Type 2 bolt loose flange with spherical flare
Inlet 2 Inside Diameter 2.75
Inlet 2 Type 2 bolt loose flange with spherical flare
Inlet Quantity 2
Inlet Type 2 bolt loose flange with spherical flare
Outlet 1 Outside Diameter 2.25
Outlet 1 Type Pipe connection
Outlet 2 Outside Diameter 2.25
Outlet 2 Type Pipe connection
Outlet Outside Diameter 2.25
Outlet Quantity 2
Outlet Type Pipe connection
Oxygen Sensor Location Pre catalyst and midbed
Substrate Material Ceramic
Product line EPA
Fits Ford · 4 vehicles

EPA-compliant design. Built for specific-fit emissions replacement on OBDII vehicles.

Stainless steel body. Corrosion-resistant construction with a ceramic substrate.

Direct-fit layout. Uses flange and pipe connections for a precise exhaust match.

Cross-references 49977 and 642821 for the same application. See all 2.

$776.00Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Order total $776.00
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.

Overview

Walker EPA 50578 is a direct-fit catalytic converter built for specific applications and engineered to meet EPA standards. It is made for OBDII vehicles and uses a stainless steel body with a ceramic substrate for dependable exhaust treatment.

Fits 2011-2014 Ford Mustang, N/A. This Walker EPA 50578 application is listed for federal and California emission models, with state-use restrictions noted in the fitment data.

Key Features

  • Direct-fit catalytic converter for specific applications
  • EPA-compliant design for OBDII vehicles
  • Stainless steel body with ceramic substrate
  • Round body shape with dual inlet and outlet connections
  • Pre-catalyst and midbed oxygen sensor locations

Detailed Description

The Walker EPA 50578 catalytic converter is built as a specific-fit replacement for the 2011-2014 Ford Mustang. Its direct-fit layout uses 2-bolt loose flange connections with spherical flare inlets and pipe connection outlets, helping match the original exhaust configuration more closely. The stainless steel body and ceramic substrate support exhaust flow and emissions control in a durable construction.

This part cross-references Walker 49977 and 642821 for the same application. The EPA line from Walker focuses on compliant replacement converters for import and domestic OBDII vehicles, and this unit follows that approach with a fitment-specific design. The part number 50578 is also useful when verifying the correct converter for the Mustang application.

What It Is Used For

  • Replacing a worn or failed catalytic converter
  • Addressing emissions-related fault codes tied to converter efficiency
  • Restoring exhaust flow through a damaged converter assembly
  • Correcting leaks at flange or pipe connection points
  • Matching the original exhaust layout on a specific-fit application

Installation Notes

Fitment notes call for an exhaust gasket, and the converter is listed with pre-catalyst and midbed oxygen sensor locations. Verify federal or state emissions requirements before installation, since the fitment data notes restrictions for California and other CARB-compliant states. Confirm the inlet and outlet dimensions, flange style, and application details before ordering.

Quality Assurance

Walker EPA products are positioned as EPA-standard replacement converters for specific OBDII applications. Part number 50578 is built to match the listed fitment and emissions configuration for the 2011-2014 Ford Mustang.

This part fits 4 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelLitersCylindersNotes
2014FordMustangBase3.7LV6Fits Fed. & Calif. Emission Models; Not legal for sale or use in California and other CARB-compliant states. Legal in New York and Maine on EPA Federal Emission Equipped Vehicles only. Consult the aftermarket converter regulations in your state for details.; Exhaust Gasket is Recommended; Ultra Direct Fit Type; EPA
2013FordMustangBase3.7LV6Fits Fed. & Calif. Emission Models; Not legal for sale or use in California and other CARB-compliant states. Legal in New York and Maine on EPA Federal Emission Equipped Vehicles only. Consult the aftermarket converter regulations in your state for details.; Exhaust Gasket is Recommended; Ultra Direct Fit Type; EPA
2012FordMustangBase3.7LV6Fits Fed. & Calif. Emission Models; Not legal for sale or use in California and other CARB-compliant states. Legal in New York and Maine on EPA Federal Emission Equipped Vehicles only. Consult the aftermarket converter regulations in your state for details.; Exhaust Gasket is Recommended; Ultra Direct Fit Type; EPA
2011FordMustangBase3.7LV6Fits Fed. & Calif. Emission Models; Not legal for sale or use in California and other CARB-compliant states. Legal in New York and Maine on EPA Federal Emission Equipped Vehicles only. Consult the aftermarket converter regulations in your state for details.; Exhaust Gasket is Recommended; Ultra Direct Fit Type; EPA
Directly replaces or cross-references 2 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
49977642821