Walker 54981 Catalytic Converter - Rear

Walker EPA Direct-Fit Catalytic Converter

Walker EPA Part Number 54981 is a direct-fit catalytic converter built for specific rear exhaust applications on select Buick, Chevrolet models. It is designed for OBDII vehicles and uses a stainless steel body with a ceramic substrate for dependable exhaust aftertreatment performance.

The Walker EPA line focuses on direct-fit replacement converters that align with federal emissions requirements for covered applications. For this part, the fitment is specific to the rear position on 2011-2016 Buick LaCrosse, 2011-2015 Buick Regal, 2014 Chevrolet Impala, and 2013-2014 Chevrolet Malibu.

Key Features

• Walker EPA catalytic converter, part number 54981
• Specific-fit design for direct replacement installation
• Stainless steel body with round housing
• Ceramic substrate material
• 3-bolt welded flange inlet and 2-bolt welded flange outlet
• Post-catalyst oxygen sensor location
• Rear exhaust position applications
• Fits federal and California emission models where noted in the fitment data

Detailed Description

Walker 54981 is a direct-fit catalytic converter for rear exhaust service on select Buick and Chevrolet vehicles. It is engineered with a round stainless steel body, ceramic substrate, and welded flange connections to match the original exhaust layout on the listed applications. This part number is used on 2011-2016 Buick LaCrosse, 2011-2015 Buick Regal, 2014 Chevrolet Impala, and 2013-2014 Chevrolet Malibu, all in the rear position.

This part cross-references 644028 and 644102 for the same application. For buyers searching by vehicle and position, this is a rear catalytic converter for Buick LaCrosse rear, Buick Regal rear, Chevrolet Impala rear, and Chevrolet Malibu rear applications. Walker 54981 is intended for EPA Federal Emission Equipped Vehicles where permitted by state regulations.

Common Issues This Part May Address

• Failed catalytic converter emissions test results
• Check engine light related to catalyst efficiency codes
• Restricted exhaust flow from a deteriorated converter
• Exhaust leaks at the converter flange connection
• Replacement needs after corrosion or internal substrate damage

Installation Notes

• Exhaust gasket is recommended for installation
• Additional parts needed to complete installation: 31728 and 31537
• Mounting hardware is not included
• Verify rear-position fitment before ordering
• Check state and local emissions rules before installation; 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, per the fitment notes

Quality Assurance

Walker Ultra Direct-Fit Catalytic Converters are built for EPA-compliant applications and are offered for import and domestic OBDII vehicles. Part number 54981 follows that direct-fit product line approach for specific emissions-related replacement needs.