Walker 81973 Catalytic Converter

Walker CalCat Direct-Fit Catalytic Converter

Walker CalCat 81973 is a direct-fit catalytic converter built for specific 1995-1997 Ford Ranger and Mazda B2300 applications. It is CARB certified and engineered for a precise OE-style fit, making it a practical replacement for emissions-related repairs on the listed vehicles.

The CalCat line is Walker’s CARB-compliant replacement converter family for OBDII and non-OBD vehicles. This application-specific design helps simplify replacement on the Ford Ranger and Mazda B2300 while maintaining the required emissions configuration for approved use cases.

• Direct-fit catalytic converter for specific Ford Ranger and Mazda B2300 applications
• CARB certified for approved California and other CARB-state applications listed in fitment
• Stainless steel body with ceramic substrate
• Small oval body shape with OE-style dimensions
• 2.5 in. inlet inside diameter with 2-bolt loose flange and spherical flare inlet
• 2-bolt welded flange outlet
• Post-catalyst oxygen sensor location
• Walker part number 81973

Detailed Product Information

Walker 81973 uses a stainless steel housing and ceramic substrate to match the needs of emissions-system replacement on the specified Ford Ranger and Mazda B2300 models. The converter is designed for a specific fit, with an overall length of 46.375 in., a 13 in. body length, and a small oval body profile that supports OE-style installation geometry. This part cross-references Monroe Shocks & Struts (e.g., 942856) for the same application.

Fitment includes 1995-1997 Ford Ranger and 1995-1997 Mazda B2300 applications, with CARB Executive Order D-182-45 noted in the vehicle-specific listings. For 1997 Ford Ranger and 1997 Mazda B2300, the part is listed for California and other states requiring CARB-compliant replacement converters. For certain Colorado listings, the notes specify EPA Federal Emission Equipped Vehicles only.

What This Converter Helps Address

• Failed catalytic converter emissions testing
• Check engine light concerns related to catalyst efficiency
• Restricted exhaust flow caused by a worn or damaged converter
• Replacement needs after corrosion or internal substrate breakdown
• Emissions-system repair on listed Ford Ranger and Mazda B2300 vehicles

Installation Notes and Tips

Compatible With 1995-1997 Ford Ranger and 1995-1997 Mazda B2300 applications listed in the fitment table. Installation notes call for additional part 31372 to complete installation, and an exhaust gasket is recommended on the Colorado-specific applications. Verify the engine family number and emissions requirements before installation, since legality varies by state and calibration.

Use the listed inlet and outlet flange styles to confirm exhaust alignment before beginning the repair. Because this is a direct-fit converter, matching the vehicle’s original emissions configuration is important for proper installation and compliance.

Quality Assurance

Walker CalCat converters are designed, tested, and validated to meet CARB standards for the approved applications shown here. The product is built for emissions compliance and OE-style fitment on the specified Ford Ranger and Mazda B2300 vehicles.

• Fits 1997 Ford Ranger, N/A
• Fits 1997 Mazda B2300, N/A
• Fits 1996 Ford Ranger, N/A
• Fits 1996 Mazda B2300, N/A
• Fits 1995 Ford Ranger, N/A
• Fits 1995 Mazda B2300, N/A