Walker 81918 Catalytic Converter - Left or Right

Walker CalCat 81918 Universal Catalytic Converter

Walker CalCat 81918 is a universal catalytic converter built for CARB-compliant replacement applications on OBDII and non-OBD vehicles. It uses a stainless steel body with a ceramic substrate and pipe connection inlet and outlet for a standard oval layout.

For drivers searching for a CARB certified catalytic converter for a 1995-2004 Toyota Tacoma, Chevrolet S10, or GMC Sonoma application, this Walker CalCat unit is designed to meet California emissions requirements where approved by the listed Executive Order.

Key Features

• CARB certified for sale and use in California and other CARB-regulated states where the application is listed
• Universal fit design for installation flexibility
• Standard oval body shape with stainless steel construction
• Ceramic substrate for emissions control performance
• 2.5 in. inlet and outlet inside diameter with pipe connection ends
• Overall length: 13.25 in.; body length: 10 in.; body width: 6.125 in.; body height: 4.25 in.
• Regular grade / economy product grade

Walker CalCat Product Line

Walker CalCat is Walker’s CARB-focused catalytic converter line. Part number 81918 is designed, tested, and validated for compliance-focused replacement use on select 1995-2004 vehicles, including applications such as Toyota Tacoma, Chevrolet Express 1500, and GMC Savana 1500. The universal format gives installers more flexibility when matching the converter to the vehicle’s exhaust layout.

Detailed Description

Walker 81918 is a universal catalytic converter with a stainless steel shell and ceramic substrate, built around a standard oval body shape. The pipe connection inlet and outlet measure 2.5 inches inside diameter, and the converter uses a no-port oxygen sensor layout. This part is CARB certified and carries Executive Order D-182-47 for the listed applications, making it a direct emissions-focused replacement choice for qualifying vehicles.

Fitment coverage includes 1995-2004 vehicles such as the 1998 Toyota Tacoma, 1997 Chevrolet S10, 1999 GMC Savana 1500, and 2004 Chevrolet Express 2500. It also appears in left, right, and N/A positions depending on the vehicle and engine family listed in the fitment data. Walker CalCat 81918 is a practical option when you need a CARB compliant universal catalytic converter with broad application coverage.

This part cross-references no additional part numbers listed for the same application.

What It Helps Address

• Failed emissions test results tied to a worn catalytic converter
• Check engine light concerns related to catalyst efficiency
• Restricted exhaust flow caused by a deteriorated substrate
• Replacement needs for CARB-regulated emissions systems
• Universal replacement requirements where vehicle-specific fit is not used

Installation Notes and Tips

Installation may require cutting, welding, or additional exhaust fabrication because this is a universal converter and mounting hardware is not included. Verify inlet and outlet diameter, overall length, body dimensions, and the vehicle’s listed position before installation. Confirm the exact engine family number and state emissions requirements before ordering, especially for California and other CARB-regulated markets.

Quality Assurance

Walker states that CalCat converters are designed, tested, and validated for compliance with CARB standards. This part is CARB certified and intended for regulated replacement use on the listed applications.