Walker 83563 Catalytic Converter - Left

Walker CalCat 83563 Overview

Walker CalCat 83563 is a direct-fit catalytic converter built for CARB-compliant replacement needs on select Ford Expedition applications. It is engineered for an OE-style fit and is designed, tested, and validated to meet California Air Resources Board standards for the listed vehicles.

For 2003-2004 Ford Expedition, Left-side applications, this Walker CalCat catalytic converter supports emissions-system repair with a direct-fit layout and vehicle-specific connections. The Walker CalCat line focuses on replacement converters for OBDII and non-OBD vehicles, with fitment and compliance considerations built into the design.

Key Features

• Direct-fit catalytic converter for specific Ford Expedition fitment
• CARB certified for listed California and CARB-state applications
• OE-style fitment for easier alignment with factory exhaust routing
• Stainless steel body construction
• Ceramic substrate material
• 2-bolt loose flange inlet with spherical flare
• Pipe connection outlet with 2.5 in. outside diameter
• Pre- and post-catalyst oxygen sensor locations
• Round and standard oval body shape
• Walker CalCat 83563 part number for catalog and service matching

Product Details

Walker CalCat 83563 is a replacement catalytic converter for 2003-2004 Ford Expedition, Left. It uses a specific-fit design with an 8 in. body length and 33.75 in. overall length, helping it match the factory exhaust layout more closely than a universal converter. The stainless steel housing and ceramic substrate are selected for emissions-system service where CARB compliance is required. This part cross-references Walker 83563 for the same application.

Common Repair Uses

• Check engine light related to catalyst efficiency
• Failed emissions inspection on a CARB-regulated vehicle
• Damaged or deteriorated factory catalytic converter
• Exhaust restriction caused by a worn substrate
• Replacement after corrosion at the converter body or flange area

Installation Notes

Fits 2004 Ford Expedition, Left. Fits 2003 Ford Expedition, Left. Verify engine family number and emissions label before installation, since CARB applications are tied to specific engine families and model-year configurations. Confirm the 2-bolt loose flange inlet and 2.5 in. outlet connection match the vehicle’s exhaust layout before assembly.

Quality Assurance

Walker CalCat converters are designed, tested, and validated for CARB compliance on the listed applications. This part is intended for use where CARB-certified replacement converters are required, including California and other states that follow CARB replacement-converter rules.