Walker 15678 Catalytic Converter

Walker EPA 15678 Catalytic Converter

Walker EPA 15678 is a direct-fit catalytic converter for pre-OBD Nissan and Mercury applications that need EPA emissions compliance. Built with a stainless steel body and ceramic substrate, it is shaped for factory-style replacement on select Nissan Pickup, Frontier, Xterra, Pathfinder, Quest, D21, Maxima, Pulsar NX, and Mercury Villager models.

Walker EPA direct-fit converters are part of the EPA-focused Standard line for older vehicles, giving buyers a replacement option for emissions repair on federal-emissions applications. This part number, 15678, is engineered around specific inlet and outlet flange connections for a straightforward exhaust service on the listed vehicles.

Key Features

• Direct-fit catalytic converter for specific applications
• EPA emissions-focused replacement for pre-OBD vehicles
• Stainless steel body with ceramic substrate
• Standard oval body shape with welded 2-bolt flange inlet and outlet
• Includes gasket in the package contents
• Oxygen sensor port location: no port location
• Fits federal and select California emission models where listed
• Walker part number 15678

Fitment Details

• Fits 2000 Nissan Frontier, N/A. Fits Fed. & Calif. Emission Models; Exhaust gasket is recommended; includes front and rear gasket; EPA.
• Fits 2000 Nissan Xterra, N/A. Fits Fed. & Calif. Emission Models; Exhaust gasket is recommended; includes front and rear gasket; EPA.
• Fits 1998-1999 Nissan Frontier, N/A. With Federal Emission System; Exhaust gasket is recommended; includes front and rear gasket; EPA.
• Fits 1996-1997 Nissan Pickup, N/A. Fits Fed. & Calif. Emission Models; Exhaust gasket is recommended; includes front and rear gasket; EPA.
• Fits 1993-1995 Mercury Villager, N/A. Fits Fed. & Calif. Emission Models; Exhaust gasket is recommended; includes front and rear gasket; EPA.
• Fits 1990-1995 Nissan Pathfinder, N/A. Fits Fed. & Calif. Emission Models; Exhaust gasket is recommended; includes front and rear gasket; EPA.
• Fits 1995 Nissan Pickup, N/A. With Federal Emission System; Exhaust gasket is recommended; includes front and rear gasket; EPA.
• Fits 1993-1995 Nissan Quest, N/A. Fits Fed. & Calif. Emission Models; Exhaust gasket is recommended; includes front and rear gasket; EPA.
• Fits 1990-1994 Nissan D21, N/A. Fits Fed. & Calif. Emission Models; Exhaust gasket is recommended; includes front and rear gasket; EPA.
• Fits 1994 Nissan D21, N/A. With Federal Emission System; Exhaust gasket is recommended; includes front and rear gasket; EPA.
• Fits 1987-1994 Nissan Maxima, N/A. Fits Fed. & Calif. Emission Models; Exhaust gasket is recommended; includes front and rear gasket; EPA.
• Fits 1987 Nissan Pulsar NX, N/A. Fits Fed. & Calif. Emission Models; Exhaust gasket is recommended; includes front and rear gasket; EPA.
• Fits 1986 Nissan Maxima, N/A. From 01/1986; Fits Fed. & Calif. Emission Models; Exhaust gasket is recommended; includes front and rear gasket; EPA.

What This Part Helps Address

• Failed emissions inspection caused by a worn catalytic converter
• Check engine light concerns related to exhaust aftertreatment efficiency
• Restricted exhaust flow from a deteriorated converter core
• Factory-style replacement needs on older Nissan and Mercury vehicles
• Exhaust leaks at the converter connection points when gaskets are serviced

Installation Notes

Verify the vehicle’s emission system before ordering. This converter is a specific-fit replacement with a 2-bolt welded flange inlet and outlet, so matching the original exhaust configuration is important. Exhaust gasket replacement is recommended during installation, and the listed fitments note front and rear gaskets.

For search reference, this part cross-references Eastern Catalytic (e.g., 40008, 40360) for the same application.

Quality Assurance

Walker EPA Standard direct-fit catalytic converters are built for EPA emissions requirements on pre-OBD vehicles and are intended for the listed federal-emissions applications. Part number 15678 is not CARB certified and is not legal for sale or use in California and other CARB-compliant states where noted in the fitment data.