Walker 81941 Catalytic Converter - Rear Left

CARB-Compliant Direct-Fit Converter

Walker CalCat 81941 is a direct-fit catalytic converter built for specific Nissan applications and validated to meet CARB standards. It is designed for a precise OE-style fit on rear left exhaust positions, with stainless steel construction and a ceramic substrate for regulated emissions service.

Key Features

• CARB certified for sale and use in California and other CARB-requiring states
• Direct-fit design for specific Nissan Frontier and Nissan Xterra applications
• Large oval body shape with stainless steel housing
• Ceramic substrate for emissions control service
• 3-bolt welded flange inlet and 2-bolt welded flange outlet
• Pre-catalyst oxygen sensor location
• Walker CalCat product line for OE-style replacement fitment

Detailed Description

Walker CalCat 81941 is engineered for 1999-2004 Nissan Frontier and Nissan Xterra rear left applications listed in the fitment data. This catalytic converter is CARB Executive Order D-182-52 approved and is intended for vehicles that require a CARB-compliant replacement converter. The direct-fit layout helps maintain factory-style exhaust routing, while the stainless steel body and ceramic substrate support emissions system replacement needs on the Nissan Frontier and Nissan Xterra.

This part cross-references replacement installation components 31559 and 31311 for the same application. The part number 81941 is a useful reference when verifying the correct converter for your vehicle and emissions configuration.

What It Helps Address

• Failed emissions testing caused by a worn or inefficient catalytic converter
• Check engine light concerns related to catalyst efficiency
• Exhaust restriction from a deteriorated converter substrate
• Need for a CARB-certified replacement on regulated vehicles
• Factory exhaust fitment issues after converter replacement

Installation Notes and Tips

Fits 2004 Nissan Frontier, rear left. Fits 2004 Nissan Xterra, rear left. Fits 2003 Nissan Frontier, rear left. Fits 2003 Nissan Xterra, rear left. Fits 2002 Nissan Frontier, rear left. Fits 2002 Nissan Xterra, rear left. Fits 2001 Nissan Frontier, rear left. Fits 2001 Nissan Xterra, rear left. Fits 2000 Nissan Frontier, rear left. Fits 2000 Nissan Xterra, rear left. Fits 1999 Nissan Frontier, rear left.

Verify the engine family number and CARB Executive Order requirements before installation. This converter uses a 3-bolt welded flange inlet and 2-bolt welded flange outlet, and the fitment notes indicate additional parts are needed to complete installation. Confirm the rear left position and exhaust configuration on your Nissan Frontier or Nissan Xterra before ordering.

Quality Assurance

Walker CalCat converters are designed, tested, and validated for CARB compliance and OE-style fitment. Part number 81941 is built for regulated emissions replacement use on the listed Nissan applications.