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WALKER 81171  
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WALKER 81171 Specifications
Body Height4.25 in
Body Length10 IN
Body MaterialStainless Steel
Body ShapeStandard Oval
Body Width6.125 in
California Air Resources Board (CARB) CertifiedYes
Inlet Quantity1
Inlet Type2 Bolt welded flange
Mounting Hardware IncludedNo
Outlet Outside Diameter2.125 in
Outlet Quantity1
Outlet Type2 Bolt welded flange
Overall Length12.5 in
C.A.R.B. Compliant
Determine your Engine Family Number to make sure you order the correct replacement converter.

Walker® CalCat® Catalytic Converters comply with specific pre-OBDII and OBDII requirements for California and other states with strict emissions standards. CalCat converters feature the right loading of precious metals, the proper catalyst material and design, and a high-technology washcoat, providing enhanced oxygen storage capacity.

  • Direct-Fit Converters designed for easy installation and OE-style fit.
  • Thicker, OE-quality flanges.
  • Body and pipe heat shields to match OE.
  • Stainless steel body.
  • Oxygen sensor fittings (where applicable).

Have You Fixed the Problem that Caused your OEM Converter to Fail?

Catalytic Converters are designed to last the life of your vehicle – they do not fail on their own. It is important to fix the source of the problem before replacing your OEM converter. There are three major reasons a converter fails:


Often caused by unburned fuel entering the converter from a faulty:

  • Spark Plug
  • Exhaust Valve
  • Oxygen Sensor
  • Fuel Injector
Burned Catalytic Converter
Burned Converter


Often caused by exposure to emissions substances from:

  • Leaky Cylinder Head Gasket
  • Silicone-Based Sealant
  • Improper Fuel (E85, Diesel)
  • Worn Piston Ring / Valve Seal
Oil Fouled Catalytic Converter
Oil Fouled Converter

Often caused by road debris, corrosion or other conditions such as:

  • Air Gap Pipe Failure
  • Flex Pipe Failure
  • Stripped O2 Sensor Threads
  • Broken Hangers
Rusted Catalytic Converter
Dented Converter

Walker Emissions Control | Diagnosing Catalytic Converter P0420 Code

Additional Resources

The Significance of the VECI Label
How to Properly Torque Flanges
Catalytic Converter Limited Warranty Registration Card
OEM / Interchange Numbers: 80871

Warranty Information:
E.P.A. Compliant: 25,000 Miles - Catalytic Performance; 5 Years/50,000 Miles - Structural Integrity
C.A.R.B. Compliant: 5 Years/50,000 Miles - Catalytic Performance & Structural Integrity